many bugfixes when adding paper through editor

pubs/commands/add_cmd.py

@@ -27,21 +27,23 @@ def parser(subparsers):
 
 def bibdata_from_editor(ui, rp):
     again = True
+    bibstr = templates.add_bib
+    while again:
         try:
             bibstr = content.editor_input(config().edit_cmd,
-                                      templates.add_bib,
+                                          bibstr,
                                           suffix='.bib')
             if bibstr == templates.add_bib:
-            cont = ui.input_yn(
+                again = ui.input_yn(
                     question='Bibfile not edited. Edit again ?',
                     default='y')
-            if not cont:
+                if not again:
                     ui.exit(0)
             else:
                 bibdata = rp.databroker.verify(bibstr)
                 bibstruct.verify_bibdata(bibdata)
                 # REFACTOR Generate citykey
-            cont = False
+                again = False
         except ValueError:
             again = ui.input_yn(
                 question='Invalid bibfile. Edit again ?',