patch 9.1.1411: crash when calling non-existing function for tabpanel

Problem:  crash when calling non-existing function for tabpanel (Yamagi,
          after v9.1.1391)
Solution: check if there was an error and if there was, set tabpanel
          option to empty to prevent showing errors on every redraw

fixes: #17364
closes: #17375
closes: #17371

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/tabpanel.c b/src/tabpanel.c
index 81e2c0c..bb7a874 100644
--- a/src/tabpanel.c
+++ b/src/tabpanel.c
@@ -496,6 +496,7 @@
 {
     int		len = 0;
     char_u	*usefmt = p_tpl;
+    int		did_emsg_before = did_emsg;
 
     if (usefmt == NULL)
 	return NULL;
@@ -525,6 +526,13 @@
 	    usefmt = p;
 
 	do_unlet((char_u *)"g:tabpanel_winid", TRUE);
+
+	if (did_emsg > did_emsg_before)
+	{
+	    usefmt = NULL;
+	    set_string_option_direct((char_u *)"tabpanel", -1, (char_u *)"",
+		    OPT_FREE | OPT_GLOBAL, SID_ERROR);
+	}
     }
 #endif