convert/subversion: rehandle the no-tags case

hgext/convert/subversion.py

@@ -206,6 +206,7 b' class convert_svn(converter_source):'
                                strict_node_history,
                                receiver)
             except SubversionException, (_, num):
+                self.ui.print_exc()
                 pickle.dump(num, fp, protocol)
             else:
                 pickle.dump(None, fp, protocol)
@@ -238,7 +239,9 b' class convert_svn(converter_source):'
 
     def gettags(self):
         tags = {}
-        for entry in self.get_log(['/tags'], 0, self.revnum(self.head)):
+        start = self.revnum(self.head)
+        try:
+            for entry in self.get_log(['/tags'], 0, start):
             orig_paths, revnum, author, date, message = entry
             for path in orig_paths:
                 if not path.startswith('/tags/'):
@@ -248,6 +251,8 b' class convert_svn(converter_source):'
                 rev = ent.copyfrom_rev
                 tag = path.split('/', 2)[2]
                 tags[tag] = self.revid(rev, module=source)
+        except SubversionException, (_, num):
+            self.ui.note('no tags found at revision %d\n' % start)
         return tags
 
     # -- helper functions --