No relation name is asked if the opening was aborted

git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@70 014f5005-505e-4b48-8d0a-63407b615a7c

maingui.py

@@ -125,7 +125,8 @@ class Ui_Form(object):
         #Default relation's name
         f=str(filename.toUtf8()).split(os.sep) #Split the full path
         defname=f[len(f)-1].lower() #Takes only the lowercase filename
-        
+        if len(defname)==0:
+            return
         use_csv=True
         
         if defname.endswith(".tlb"):