Added missing returns on error scenarios

(cherry picked from commit 3d9ef1e4de67ba47569775e286a54b3f5a4d0393)

servers/visual/shader_language.cpp

@@ -4698,16 +4698,16 @@ Error ShaderLanguage::_parse_block(BlockNode *p_block, const Map<StringName, Bui
 			pos = _get_tkpos();
 			tk = _get_token();
 			if (tk.type != TK_SEMICOLON) {
-				//all is good
 				_set_error("Expected ';' after discard");
+				return ERR_PARSE_ERROR;
 			}
 
 			p_block->statements.push_back(flow);
 		} else if (tk.type == TK_CF_BREAK) {
 
 			if (!p_can_break) {
-				//all is good
-				_set_error("Breaking is not allowed here");
+				_set_error("'break' is not allowed outside of a loop or 'switch' statement");
+				return ERR_PARSE_ERROR;
 			}
 
 			ControlFlowNode *flow = alloc_node<ControlFlowNode>();
@@ -4716,8 +4716,8 @@ Error ShaderLanguage::_parse_block(BlockNode *p_block, const Map<StringName, Bui
 			pos = _get_tkpos();
 			tk = _get_token();
 			if (tk.type != TK_SEMICOLON) {
-				//all is good
 				_set_error("Expected ';' after break");
+				return ERR_PARSE_ERROR;
 			}
 
 			p_block->statements.push_back(flow);
@@ -4733,8 +4733,8 @@ Error ShaderLanguage::_parse_block(BlockNode *p_block, const Map<StringName, Bui
 		} else if (tk.type == TK_CF_CONTINUE) {
 
 			if (!p_can_continue) {
-				//all is good
-				_set_error("Continuing is not allowed here");
+				_set_error("'continue' is not allowed outside of a loop");
+				return ERR_PARSE_ERROR;
 			}
 
 			ControlFlowNode *flow = alloc_node<ControlFlowNode>();
@@ -4745,6 +4745,7 @@ Error ShaderLanguage::_parse_block(BlockNode *p_block, const Map<StringName, Bui
 			if (tk.type != TK_SEMICOLON) {
 				//all is good
 				_set_error("Expected ';' after continue");
+				return ERR_PARSE_ERROR;
 			}
 
 			p_block->statements.push_back(flow);