Merge pull request #2075 from NariyasuHeseri/awk_unterminated_regexp

helpers: fix `awk: unterminated regexp`

lib/helpers.bash

@@ -326,7 +326,7 @@ function _bash-it-update-() {
 		fi
 
 		for i in $(git rev-list --merges --first-parent "${revision}"); do
-			num_of_lines=$(git log -1 --format=%B "$i" | awk '!/^[[:space:]]*$ {++i} END{print i}')
+			num_of_lines=$(git log -1 --format=%B "$i" | awk '!/^[[:space:]]*$/ {++i} END{print i}')
 			if [[ "$num_of_lines" -eq 1 ]]; then
 				description="%s"
 			else