add more strict checks for twist .msg fields corectness

js/twister_actions.js

@@ -157,8 +157,10 @@ function requestRTs(postLi)
 }
 
 function appendPostToElem(post, elem) {
-    // posts without 'msg' and 'rt.msg' may be used for metadata like 'url' and are not meant to be displayed
+    // posts without non-empty strings in both 'msg' and 'rt.msg' may be used for metadata like 'url' and are not meant to be displayed
-    if (!post.userpost.msg && (!post.userpost.rt || (post.userpost.rt && !post.userpost.rt.msg)))
+    if ((typeof post.userpost.msg !== 'string' || post.userpost.msg === '')
+        && (typeof post.userpost.rt !== 'object'
+            || typeof post.userpost.rt.msg !== 'string' || post.userpost.rt.msg === ''))
         return;
 
     postToElem(post, 'original').hide().appendTo(elem).slideDown('fast');

js/twister_formatpost.js

@@ -60,7 +60,7 @@ function postToElem(post, kind, promoted) {
     if (post.sig_wort)
         userpost.sig_wort = post.sig_wort;
 
-    if (userpost.rt && userpost.rt.msg) {
+    if (userpost.rt && typeof userpost.rt.msg === 'string' && userpost.rt.msg !== '') {
         rt = userpost.rt;
         if (userpost.msg) {
             username = userpost.n;
@@ -86,6 +86,8 @@ function postToElem(post, kind, promoted) {
         content_to_rt = $.toJSON(userpost);
         content_to_sigrt = post.sig_userpost;
     }
+    if (typeof msg !== 'string')
+        msg = '';
 
     // Now create the html elements
     var elem = $.MAL.getPostTemplate().clone(true).appendTo(twister.html.detached);

js/twister_timeline.js

@@ -347,8 +347,10 @@ function timelineChangedUser()
 }
 
 function willBeHidden(post) {
-    // posts without 'msg' and 'rt.msg' may be used for metadata like 'url' and are not meant to be displayed
+    // posts without non-empty strings in both 'msg' and 'rt.msg' may be used for metadata like 'url' and are not meant to be displayed
-    if (!post.userpost.msg && (!post.userpost.rt || (post.userpost.rt && !post.userpost.rt.msg)))
+    if ((typeof post.userpost.msg !== 'string' || post.userpost.msg === '')
+        && (typeof post.userpost.rt !== 'object'
+            || typeof post.userpost.rt.msg !== 'string' || post.userpost.rt.msg === ''))
         return true;
 
     if (post['userpost']['n'] === defaultScreenName)