--- a/install.py	Sat Jun 02 12:42:59 2018 +0200
+++ b/install.py	Sun Jun 03 11:30:15 2018 +0200
@@ -1338,6 +1338,8 @@
                     message = None
                 except ImportError as msg:
                     message = str(msg)
+            else:
+                message = "QScintilla could not be installed."
         if message:
             print("Sorry, please install QScintilla2 and")
             print("its PyQt5/PyQt4 wrapper.")