Material Conversion Error Handling

Material Conversion Plugins now ERR_FAIL if called on an unitialized material.

FileSystemDock no longer crashes if Conversion Plugin fails and returns a null ref.

(cherry picked from commit 05fd79af7c706c8bda112f4ec3eb95977a96bc9d)

editor/filesystem_dock.cpp

@@ -1880,6 +1880,7 @@ void FileSystemDock::_convert_dialog_action() {
 			for (const String &target : cached_valid_conversion_targets) {
 				if (conversion_id == selected_conversion_id && conversion->converts_to() == target) {
 					Ref<Resource> converted_res = conversion->convert(res);
+					ERR_FAIL_COND(converted_res.is_null());
 					ERR_FAIL_COND(res.is_null());
 					converted_resources.push_back(converted_res);
 					resources_to_erase_history_for.insert(res);

editor/plugins/material_editor_plugin.cpp

@@ -450,6 +450,7 @@ bool StandardMaterial3DConversionPlugin::handles(const Ref<Resource> &p_resource
 Ref<Resource> StandardMaterial3DConversionPlugin::convert(const Ref<Resource> &p_resource) const {
 	Ref<StandardMaterial3D> mat = p_resource;
 	ERR_FAIL_COND_V(mat.is_null(), Ref<Resource>());
+	ERR_FAIL_COND_V(!mat->_is_initialized(), Ref<Resource>());
 
 	Ref<ShaderMaterial> smat;
 	smat.instantiate();
@@ -496,6 +497,7 @@ bool ORMMaterial3DConversionPlugin::handles(const Ref<Resource> &p_resource) con
 Ref<Resource> ORMMaterial3DConversionPlugin::convert(const Ref<Resource> &p_resource) const {
 	Ref<ORMMaterial3D> mat = p_resource;
 	ERR_FAIL_COND_V(mat.is_null(), Ref<Resource>());
+	ERR_FAIL_COND_V(!mat->_is_initialized(), Ref<Resource>());
 
 	Ref<ShaderMaterial> smat;
 	smat.instantiate();
@@ -542,6 +544,7 @@ bool ParticleProcessMaterialConversionPlugin::handles(const Ref<Resource> &p_res
 Ref<Resource> ParticleProcessMaterialConversionPlugin::convert(const Ref<Resource> &p_resource) const {
 	Ref<ParticleProcessMaterial> mat = p_resource;
 	ERR_FAIL_COND_V(mat.is_null(), Ref<Resource>());
+	ERR_FAIL_COND_V(!mat->_is_initialized(), Ref<Resource>());
 
 	Ref<ShaderMaterial> smat;
 	smat.instantiate();
@@ -581,6 +584,7 @@ bool CanvasItemMaterialConversionPlugin::handles(const Ref<Resource> &p_resource
 Ref<Resource> CanvasItemMaterialConversionPlugin::convert(const Ref<Resource> &p_resource) const {
 	Ref<CanvasItemMaterial> mat = p_resource;
 	ERR_FAIL_COND_V(mat.is_null(), Ref<Resource>());
+	ERR_FAIL_COND_V(!mat->_is_initialized(), Ref<Resource>());
 
 	Ref<ShaderMaterial> smat;
 	smat.instantiate();
@@ -620,6 +624,7 @@ bool ProceduralSkyMaterialConversionPlugin::handles(const Ref<Resource> &p_resou
 Ref<Resource> ProceduralSkyMaterialConversionPlugin::convert(const Ref<Resource> &p_resource) const {
 	Ref<ProceduralSkyMaterial> mat = p_resource;
 	ERR_FAIL_COND_V(mat.is_null(), Ref<Resource>());
+	ERR_FAIL_COND_V(!mat->_is_initialized(), Ref<Resource>());
 
 	Ref<ShaderMaterial> smat;
 	smat.instantiate();
@@ -659,6 +664,7 @@ bool PanoramaSkyMaterialConversionPlugin::handles(const Ref<Resource> &p_resourc
 Ref<Resource> PanoramaSkyMaterialConversionPlugin::convert(const Ref<Resource> &p_resource) const {
 	Ref<PanoramaSkyMaterial> mat = p_resource;
 	ERR_FAIL_COND_V(mat.is_null(), Ref<Resource>());
+	ERR_FAIL_COND_V(!mat->_is_initialized(), Ref<Resource>());
 
 	Ref<ShaderMaterial> smat;
 	smat.instantiate();
@@ -698,6 +704,7 @@ bool PhysicalSkyMaterialConversionPlugin::handles(const Ref<Resource> &p_resourc
 Ref<Resource> PhysicalSkyMaterialConversionPlugin::convert(const Ref<Resource> &p_resource) const {
 	Ref<PhysicalSkyMaterial> mat = p_resource;
 	ERR_FAIL_COND_V(mat.is_null(), Ref<Resource>());
+	ERR_FAIL_COND_V(!mat->_is_initialized(), Ref<Resource>());
 
 	Ref<ShaderMaterial> smat;
 	smat.instantiate();
@@ -737,6 +744,7 @@ bool FogMaterialConversionPlugin::handles(const Ref<Resource> &p_resource) const
 Ref<Resource> FogMaterialConversionPlugin::convert(const Ref<Resource> &p_resource) const {
 	Ref<FogMaterial> mat = p_resource;
 	ERR_FAIL_COND_V(mat.is_null(), Ref<Resource>());
+	ERR_FAIL_COND_V(!mat->_is_initialized(), Ref<Resource>());
 
 	Ref<ShaderMaterial> smat;
 	smat.instantiate();

scene/resources/material.h

@@ -65,7 +65,6 @@ protected:
 
 	void _mark_ready();
 	void _mark_initialized(const Callable &p_add_to_dirty_list, const Callable &p_update_shader);
-	bool _is_initialized() { return init_state == INIT_STATE_READY; }
 
 	GDVIRTUAL0RC_REQUIRED(RID, _get_shader_rid)
 	GDVIRTUAL0RC_REQUIRED(Shader::Mode, _get_shader_mode)
@@ -76,6 +75,9 @@ public:
 		RENDER_PRIORITY_MAX = RS::MATERIAL_RENDER_PRIORITY_MAX,
 		RENDER_PRIORITY_MIN = RS::MATERIAL_RENDER_PRIORITY_MIN,
 	};
+
+	bool _is_initialized() { return init_state == INIT_STATE_READY; }
+
 	void set_next_pass(const Ref<Material> &p_pass);
 	Ref<Material> get_next_pass() const;