Don't error if there are no files to shellcheck

pre-commit.shellcheck

@@ -25,14 +25,6 @@ function get_shell_files {
 	get_staged_files | grep --regexp=".*\.sh$" --regexp="\.bash.*$" --regexp="\.zsh.*$"
 }
 
-#function blah {
-#
-
-	#while read -r file; do
-		#files[${files[@]}+1]="$file"
-	#done < <()
-#}
-
 function main {
 	check_dependencies_installed
 
@@ -41,7 +33,9 @@ function main {
 		files[${files[@]}+1]="$file"
 	done < <(get_shell_files)
 
-	shellcheck "${files[@]}"
+	if [[ "${#files[@]}" -ne 0 ]]; then
+		shellcheck "${files[@]}"
+	fi
 }
 
 main