Fix pyqt6 loader on windows (#1797)

src/debugpy/_vendored/pydevd/pydev_ipython/qt_loaders.py

@@ -145,25 +145,28 @@ def has_binding(api):
             return True
 
     except ModuleNotFoundError:
-        from importlib import machinery
-
-        # importing top level PyQt4/PySide module is ok...
-        mod = __import__(module_name)
-
-        # ...importing submodules is not
-        loader_details = (machinery.ExtensionFileLoader, machinery.EXTENSION_SUFFIXES)
-        submod_finder = machinery.FileFinder(mod.__path__[0], loader_details)
-        submod_check = (
-            submod_finder.find_spec("QtCore") is not None
-            and submod_finder.find_spec("QtGui") is not None
-            and submod_finder.find_spec("QtSvg") is not None
-        )
+        try:
+            from importlib import machinery
+
+            # importing top level PyQt4/PySide module is ok...
+            mod = __import__(module_name)
+
+            # ...importing submodules is not
+            loader_details = (machinery.ExtensionFileLoader, machinery.EXTENSION_SUFFIXES)
+            submod_finder = machinery.FileFinder(mod.__path__[0], loader_details)
+            submod_check = (
+                submod_finder.find_spec("QtCore") is not None
+                and submod_finder.find_spec("QtGui") is not None
+                and submod_finder.find_spec("QtSvg") is not None
+            )
 
-        # we can also safely check PySide version
-        if api == QT_API_PYSIDE:
-            return check_version(mod.__version__, '1.0.3') and submod_check
-        else:
-            return submod_check
+            # we can also safely check PySide version
+            if api == QT_API_PYSIDE:
+                return check_version(mod.__version__, '1.0.3') and submod_check
+            else:
+                return submod_check
+        except:
+            return False
 
     except ImportError:
         return False