Pcbnew: avoid crash if something is wrong when opening the Python Console (for instance missing python module)

common/kiway.cpp

@@ -212,7 +212,7 @@ KIFACE*  KIWAY::KiFACE( FACE_T aFaceId, bool doLoad )
         if( ! wxFileExists( dname ) )
             msg << wxT( "It is missing.\n" );
         else
-            msg << wxT( "Perhaps a wxWidgets shared (.dll or .so) file is missing.\n" );
+            msg << wxT( "Perhaps a shared library (.dll or .so) file is missing.\n" );
 
         msg << wxT( "From command line: argv[0]:\n'" );
         msg << wxStandardPaths::Get().GetExecutablePath() << wxT( "'\n" );

pcbnew/pcbframe.cpp

@@ -997,7 +997,10 @@ void PCB_EDIT_FRAME::ScriptingConsoleEnableDisable( wxCommandEvent& aEvent )
     else
         pythonPanelShown = ! pythonPanelFrame->IsShown();
 
-    pythonPanelFrame->Show( pythonPanelShown );
+    if( pythonPanelFrame )
+        pythonPanelFrame->Show( pythonPanelShown );
+    else
+        wxMessageBox( wxT( "Error: unable to create the Python Console" ) );
 }
 
 #endif