ircmsg can no longer segfault on empty input

src/irc.c

@@ -58,6 +58,7 @@ DECL void
 ircmsg(const char* fmt,
        ...)
 {
+  if(!strcmp(fmt, "") || fmt == NULL){ return; }
   va_list args;
   char * fmtdmsg;
   char * swp;