convert: more cleanup in svn directory copy handling

hgext/convert/subversion.py

@@ -675,9 +675,11 class svn_source(converter_source):
                 # Copies here (must copy all from source)
                 # Probably not a real problem for us if
                 # source does not exist
-                if ent.copyfrom_path:
+                if not ent.copyfrom_path:
+                    continue
                     copyfrompath = self.getrelpath(ent.copyfrom_path.decode(self.encoding))
-                    if copyfrompath:
+                if not copyfrompath:
+                    continue
                         copyfrom[path] = ent
                         self.ui.debug("mark %s came from %s:%d\n" 
                                       % (path, copyfrompath, ent.copyfrom_rev))