feeds: fix delete/rmv code

morss/feeds.py

@@ -495,8 +495,9 @@ class ParserJSON(ParserBase):
         return json.loads(raw)
 
     def remove(self):
-        # delete oneself FIXME
-        pass
+        # impossible to "delete" oneself per se but can clear all its items
+        for attr in self.root:
+            del self.root[attr]
 
     def tostring(self, encoding='unicode', **k):
         dump = json.dumps(self.root, ensure_ascii=False, **k) # ensure_ascii = False to have proper (unicode) string and not \u00
@@ -556,11 +557,16 @@ class ParserJSON(ParserBase):
         rrule = self._rule_parse(rule)
         cur = self.root
 
+        try:
             for node in rrule[:-1]:
                 cur = cur[node]
 
             del cur[rrule[-1]]
 
+        except KeyError:
+            # nothing to delete
+            pass
+
     def rule_set(self, rule, value):
         if '[]' in rule:
             raise ValueError('not supported') # FIXME