Backport PR #15291: Remove error_msg_qt from backend_qt4.

ivanov · MeeseeksDev[bot] · commit 29db5e419cf1 · 2019-09-21T06:43:40.000Z
diff --git a/lib/matplotlib/backends/backend_qt4.py b/lib/matplotlib/backends/backend_qt4.py
@@ -1,8 +1,7 @@
 from .backend_qt5 import (
     backend_version, SPECIAL_KEYS, SUPER, ALT, CTRL, SHIFT, MODIFIER_KEYS,
     cursord, _create_qApp, _BackendQT5, TimerQT, MainWindow, FigureCanvasQT,
-    FigureManagerQT, NavigationToolbar2QT, SubplotToolQt, error_msg_qt,
-    exception_handler)
+    FigureManagerQT, NavigationToolbar2QT, SubplotToolQt, exception_handler)
 
 
 @_BackendQT5.export
