fix parsing field names for form dialog

src/form.c

@@ -1108,7 +1108,7 @@ form_create_widget (GtkWidget * dlg)
               }
 
             case YAD_FIELD_LABEL:
-              if (fld->name[0])
+              if (fld->name && fld->name[0])
                 {
                   gchar *buf = g_strcompress (fld->name);
                   e = gtk_label_new (NULL);

src/option.c

@@ -784,7 +784,8 @@ add_field (const gchar * option_name, const gchar * value, gpointer data, GError
     }
   else
     {
-      fld->name = g_strdup (names[0]);
+      if (names[0] && *names[0])
+        fld->name = g_strdup (names[0]);
       if (names[1])
         fld->tip = g_strdup (names[1]);
     }