fix 342886 crash when removing the last tag on a message after adding and removing the last tag before, sr=mscott

git-svn-id: svn://10.0.0.236/trunk@201316 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/mailnews/base/src/nsMsgDBView.cpp

@@ -360,6 +360,11 @@ nsresult nsMsgDBView::AppendKeywordProperties(const char *keywords, nsISupportsA
   // append that as a property.
   nsCStringArray keywordsArray;
   nsCAutoString color;
+  // skip leading spaces 
+  while (*keywords == ' ')
+    keywords++;
+  if (!*keywords)
+    return NS_OK;
   keywordsArray.ParseString(keywords, " ");
   nsresult rv;
   if (!mTagService)

mozilla/mailnews/base/util/nsMsgUtils.cpp

@@ -1243,6 +1243,8 @@ PRBool MsgFindKeyword(const nsACString &keyword, nsACString &keywords, nsACStrin
       {
         if (*end == ' ')
           end++;
+        if (*beforeStart == ' ' && endMatches)
+          start--;
         return PR_TRUE;
       }
       else