add guard for model difference

Author: themisvaltinos

sqlmesh/integrations/github/cicd/controller.py

@@ -461,12 +461,13 @@ def get_plan_summary(self, plan: Plan) -> str:
                 context_diff=plan.context_diff,
                 no_diff=False,
             )
-            self._console.show_model_difference_summary(
-                context_diff=plan.context_diff,
-                environment_naming_info=plan.environment_naming_info,
-                default_catalog=self._context.default_catalog,
-                no_diff=False,
-            )
+            if plan.context_diff.has_changes:
+                self._console.show_model_difference_summary(
+                    context_diff=plan.context_diff,
+                    environment_naming_info=plan.environment_naming_info,
+                    default_catalog=self._context.default_catalog,
+                    no_diff=False,
+                )
             difference_summary = self._console.consume_captured_output()
             self._console._show_missing_dates(plan, self._context.default_catalog)
             missing_dates = self._console.consume_captured_output()