Catch operator error report #Blender

blender-operator-catch-error-and-report.py

# http://blender.stackexchange.com/q/63347/3710

import bpy
  
class CustomDissolveEdgeOperator(bpy.types.Operator):
    bl_idname = 'custom.dissolve_edges'
    bl_label = 'Custom Edge Dissolve'
    bl_options = {'REGISTER', 'UNDO'}
    
    '''
    @classmethod
    def poll(cls, context):
        return bpy.ops.mesh.dissolve_edges.poll()
    '''
    
    def execute(self, context):
        
        if bpy.ops.mesh.dissolve_edges.poll():
            print("Context correct")
            try:
                bpy.ops.mesh.dissolve_edges()
            except RuntimeError as exception:
                error = " ".join(exception.args)
                print("error:", error)
                self.report({'ERROR'}, error)
        else:
            print ("Context incorrect")
            self.report({'ERROR'}, "Context incorrect")
            
        return {'FINISHED'}

def draw_edge_dissolve(self, context):
    layout = self.layout
    layout.operator("custom.dissolve_edges")

def register():
    bpy.utils.register_class(CustomDissolveEdgeOperator)
    bpy.types.VIEW3D_MT_edit_mesh_delete.append(draw_edge_dissolve)

def unregister():
    bpy.utils.unregister_class(CustomDissolveEdgeOperator)
    bpy.types.VIEW3D_MT_edit_mesh_delete.remove(draw_edge_dissolve)

if __name__ == "__main__":
    register()