fixed bug 45727 -- Problems with download (POP) truncated msg from folder other than Inbox; disable fileters while downloading truncated message; bullet prove to prevent accessing empty string buffer; r=mscott

mailnews/local/src/nsPop3Sink.cpp

@@ -179,6 +179,9 @@ nsPop3Sink::BeginMailDelivery(PRBool uidlDownload, PRBool* aBool)
 		rv = NS_OK;
 	}
 
+    if (uidlDownload && m_newMailParser)
+        m_newMailParser->DisableFilters();
+
 #ifdef DEBUG
     printf("Begin mail message delivery.\n");
 #endif 

mailnews/mime/src/mimei.cpp

@@ -791,6 +791,8 @@ mime_set_url_part(const char *url, char *part, PRBool append_p)
   const char *s;
   char *result;
 
+  if (!url || !part) return 0;
+
   for (s = url; *s; s++)
 	{
 	  if (*s == '?')