GDScript: Fix POT generator crash on assignee with index

modules/gdscript/editor/gdscript_translation_parser_plugin.cpp

@@ -225,10 +225,15 @@ void GDScriptEditorTranslationParserPlugin::_assess_assignment(const GDScriptPar
 	if (p_assignment->assignee->type == GDScriptParser::Node::IDENTIFIER) {
 		assignee_name = static_cast<const GDScriptParser::IdentifierNode *>(p_assignment->assignee)->name;
 	} else if (p_assignment->assignee->type == GDScriptParser::Node::SUBSCRIPT) {
-		assignee_name = static_cast<const GDScriptParser::SubscriptNode *>(p_assignment->assignee)->attribute->name;
+		const GDScriptParser::SubscriptNode *subscript = static_cast<const GDScriptParser::SubscriptNode *>(p_assignment->assignee);
+		if (subscript->is_attribute && subscript->attribute) {
+			assignee_name = subscript->attribute->name;
+		} else if (subscript->index && _is_constant_string(subscript->index)) {
+			assignee_name = subscript->index->reduced_value;
+		}
 	}
 
-	if (assignment_patterns.has(assignee_name) && _is_constant_string(p_assignment->assigned_value)) {
+	if (assignee_name != StringName() && assignment_patterns.has(assignee_name) && _is_constant_string(p_assignment->assigned_value)) {
 		// If the assignment is towards one of the extract patterns (text, tooltip_text etc.), and the value is a constant string, we collect the string.
 		ids->push_back(p_assignment->assigned_value->reduced_value);
 	} else if (assignee_name == fd_filters && p_assignment->assigned_value->type == GDScriptParser::Node::CALL) {
@@ -236,7 +241,7 @@ void GDScriptEditorTranslationParserPlugin::_assess_assignment(const GDScriptPar
 		// get_node("FileDialog").filters = PackedStringArray(["*.png ; PNG Images","*.gd ; GDScript Files"]).
 
 		const GDScriptParser::CallNode *call_node = static_cast<const GDScriptParser::CallNode *>(p_assignment->assigned_value);
-		if (call_node->arguments[0]->type == GDScriptParser::Node::ARRAY) {
+		if (!call_node->arguments.is_empty() && call_node->arguments[0]->type == GDScriptParser::Node::ARRAY) {
 			const GDScriptParser::ArrayNode *array_node = static_cast<const GDScriptParser::ArrayNode *>(call_node->arguments[0]);
 
 			// Extract the name in "extension ; name" of PackedStringArray.