Improved handling of "tkinter not awailable"

tools/postbuild.py

@@ -88,7 +88,10 @@ def CreateFs( fsName, mkFsName ):
         raise ProcessError( "CreateFs: data dir is not a directory: %s" % dataDir )
     FilesInDir = CountFilesInDir( dataDir )
     if FilesInDir == 0:
-        if not ConfirmDialog( "%s Create" % fsName, "No files have been found in your data folder!\nAre you sure you want to create an empty %s image?" % fsName ):
+        answer = ConfirmDialog( "%s Create" % fsName, "No files have been found in your data folder!\nAre you sure you want to create an empty %s image?" % fsName )
+        if answer < 0:
+            raise ProcessError( "tkinter not available.\nCan't ask 'Are you sure you want to create an empty ... image?'\nPlease install it with:\npip3 install tkinter\n" )
+        elif:
             raise ProcessError( "Canceled by user" )
     os.makedirs( DstDir, exist_ok = True )
     imageName = "%s.%s" % ( Args.name, fsName )

tools/utillities.py

@@ -77,14 +77,15 @@ def RemoveIno( path ):
     return path
 
 def ConfirmDialog( title, text ):
+    """ return -1 if tkinter not installed, 0 if aswer was no, 1 if answer was yes """
     try:
         import tkinter
         from tkinter import messagebox
     except:
-        raise ProcessError( "tkinter not available.\nPlease install it with:\npip3 install tkinter\n" )
+        return -1
     rootWin = tkinter.Tk() # Create the object
     rootWin.overrideredirect( 1 ) # Avoid it appearing and then disappearing quickly
     #rootWin.iconbitmap("PythonIcon.ico") # Set an icon (this is optional - must be in a .ico format)
     rootWin.withdraw() # Hide the window as we do not want to see this one
-    return messagebox.askyesno( title, text, parent = rootWin )
+    return 1 if messagebox.askyesno( title, text, parent = rootWin ) else 0