Fix shellcheck issue with array

Author: Raleksan

steps/report.sh

@@ -52,7 +52,10 @@ st_list=${TARGET}/temp/structured-list-of-metrics.tex
 rm -f "${st_list}"
 touch "${st_list}"
 
-groups=($(grep -oP '\[.*?\]' "${list}" | sed 's/[][]//g' || : ) "Ungrouped metrics")
+groups=()
+while IFS='' read -r line; do
+    groups+=("$line")
+done < <(grep -oP '\[.*?\]' "${list}" | sed 's/[][]//g' || : ; echo "Ungrouped metrics")
 for idx in ${!groups[@]}; do
     printf "\\item %s\n" "${groups[$idx]}" >> "${st_list}"
     printf "\\\\begin{itemize}\n" >> "${st_list}"