Fixed crash bug if yad is not installed and agm is launched from a gui. Insure AGM is not ran as the root users. If people who really should know better still need training wheels, actual newbies might need the protection as well.

.includes/dialog-interface.sh

@@ -10,8 +10,10 @@
 if [[ -z "$dialogType" ]]; then
     if [[ -z "$DISPLAY" ]]; then
         dialogType="dialog"
-    else
+    elif command -v yad &> /dev/null; then
         dialogType="yad"
+    else
+        dialogType="dialog"
     fi
 fi