Don't crash if file doesn't exist

webif/lib/safe_delete

@@ -28,6 +28,8 @@ if {![exists -proc _del_bindir]} {
 	proc safe_delete {file {px ""}} {
 		global _del_dustbin
 
+		if {![file exists $file]} return 1
+
 		# Check if undelete is installed and that the file being
 		# deleted is not already in the dustbin.
 		set dustbin 1