Fix some bugs spotted by asan in editor debugger.

EditorDebuggerInspector is in tree, so it gets automatically deleted,
when clearing errors the debugger should not fake a process
notification.

editor/debugger/editor_debugger_inspector.cpp

@@ -91,6 +91,7 @@ EditorDebuggerInspector::EditorDebuggerInspector() {
 }
 
 EditorDebuggerInspector::~EditorDebuggerInspector() {
+	clear_cache();
 	memdelete(variables);
 }