add broken plugin for testing error stack

InvenTree/plugin/samples/integration/broken_sample.py

@@ -0,0 +1,11 @@
+"""sample implementation for IntegrationPlugin"""
+from plugin.integration import IntegrationPluginBase
+
+aaa = bb
+
+class BrokenIntegrationPlugin(IntegrationPluginBase):
+    """
+    An very broken integration plugin
+    """
+
+    PLUGIN_NAME = "BrokenIntegrationPlugin"