flake8 fixes

install.py

@@ -72,7 +72,7 @@ if buildWindowed:
 
 instOpt.append("novelWriter.py")
 
-import PyInstaller.__main__
+import PyInstaller.__main__ # noqa: F401
 PyInstaller.__main__.run(instOpt)
 
 print("")
@@ -82,4 +82,3 @@ print("##################")
 print("")
 print("If everything went well, the novelWriter executable should be in the folder named 'dist'")
 print("")
-

novelWriter.py

@@ -4,10 +4,10 @@
 import sys
 
 try:
-    import PyQt5.QtWidgets
-    import PyQt5.QtGui
-    import PyQt5.QtCore
-except:
+    import PyQt5.QtWidgets # noqa: F401
+    import PyQt5.QtGui # noqa: F401
+    import PyQt5.QtCore # noqa: F401
+except Exception:
     print("ERROR: Failed to load dependency python3-pyqt5")
     sys.exit(1)