git-gui: avoid an error message when removing the last remote

When the last remote is removed on a system that has tearoff menu items
the code that adjusts the fetch and prune menus may raise an error when
probing the menu entry for a non-existing -label option.
Check the entry type to avoid this fault.

Reported-by: Vedran Miletić <rivanvx@gmail.com>
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>
diff --git a/lib/remote.tcl b/lib/remote.tcl
index 5e4e7f4..4e5c784 100644
--- a/lib/remote.tcl
+++ b/lib/remote.tcl
@@ -245,7 +245,8 @@
 	set prune_m $remote_m.prune
 	if {$have_remote > 1} {
 		make_sure_remote_submenues_exist $remote_m
-		if {[$fetch_m entrycget end -label] ne "All"} {
+		if {[$fetch_m type end] eq "command" \
+			&& [$fetch_m entrycget end -label] ne "All"} {
 
 			$fetch_m insert end separator
 			$fetch_m insert end command \
@@ -259,7 +260,8 @@
 		}
 	} else {
 		if {[winfo exists $fetch_m]} {
-			if {[$fetch_m entrycget end -label] eq "All"} {
+			if {[$fetch_m type end] eq "command" \
+				&& [$fetch_m entrycget end -label] eq "All"} {
 
 				delete_from_menu $fetch_m end
 				delete_from_menu $fetch_m end