Check if the Submit button should be active after removing a file

http://tickets.musicbrainz.org/browse/PICARD-82

NEWS.txt

@@ -1,6 +1,7 @@
 Version 1.0.1 - unreleased
  * Always show basic tags in metadata comparison box, even if empty (title,
    artist, album, tracknumber, ~length, date) (PICARD-201)
+ * Fixed AcoustID submission failure after removing files from Picard (PICARD-82)
 
 Version 1.0 - 2012-06-02
  * New UI: Extended comparison of existing vs. MB metadata & tags (PICARD-43)

picard/acoustidmanager.py

@@ -56,6 +56,7 @@ class AcoustIDManager(QtCore.QObject):
     def remove(self, file):
         if file in self._fingerprints:
             del self._fingerprints[file]
+        self._check_unsubmitted()
 
     def _unsubmitted(self):
         for submission in self._fingerprints.itervalues():
@@ -71,6 +72,9 @@ class AcoustIDManager(QtCore.QObject):
 
     def submit(self):
         fingerprints = list(self._unsubmitted())
+        if not fingerprints:
+            self._check_unsubmitted()
+            return
         self.tagger.window.set_statusbar_message(N_('Submitting AcoustIDs...'))
         self.tagger.xmlws.submit_acoustid_fingerprints(fingerprints, partial(self.__fingerprint_submission_finished, fingerprints))