fix(comment): content not mandatory

frappe/core/doctype/comment/comment.json

@@ -459,7 +459,7 @@
    "read_only": 0,
    "remember_last_selected_value": 0,
    "report_hide": 0,
-   "reqd": 1,
+   "reqd": 0,
    "search_index": 0,
    "set_only_once": 0,
    "translatable": 0,
@@ -476,7 +476,7 @@
  "issingle": 0,
  "istable": 0,
  "max_attachments": 0,
- "modified": "2019-02-07 16:06:05.455876",
+ "modified": "2019-02-07 20:28:46.073567",
  "modified_by": "Administrator",
  "module": "Core",
  "name": "Comment",