Python: Improve auto detection

Do not list app installer redirectors as python
executables. Windows may put empty redirector files
with the same name in a path that is prepended to
PATH for the respective user.

Change-Id: I9418784ef099df72ef8d0426e55198b30fbeed6a
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/python/pythonsettings.cpp

@@ -405,6 +405,9 @@ static void addPythonsFromPath(QList<Interpreter> &pythons)
 
     if (HostOsInfo::isWindowsHost()) {
         for (const FilePath &executable : env.findAllInPath("python")) {
+            // Windows creates empty redirector files that may interfere
+            if (executable.toFileInfo().size() == 0)
+                continue;
             if (executable.exists() && !alreadyRegistered(pythons, executable))
                 pythons << Interpreter(executable, "Python from Path");
         }