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Use guard to make sure variables are sane

--- a/autotag

+++ b/autotag

@@ -4,7 +4,12 @@

 name="`xprop -id "$1" | awk '/WM_CLASS/{print $NF}' | tr -d '"' `"

 awk -v r="$name" '$0 ~ r {print $2, $3}' "$WIN" | while read -r flag tag; do

-	test "$flag" = true && wtf "$flag" && chwso "$1"

-	grp "$tag" "$1"

-	/usr/local/share/hwwm/groupsbar

+	if test "$flag" = true; then

+		wtf "$flag"

+		chwso "$1"

+	fi

+	if test "$tag" != ""; then

+		grp "$tag" "$1"

+		/usr/local/share/hwwm/groupsbar

+	fi

 done