handle error code in pandoc

diffgeoIII/compile.sh

 cp edit-this-file.tex tmp.tex
 python3 preprocessor.py
 pandoc -f org -t latex tmp.tex -s -o for-compile.tex --metadata-file meta.yaml --template="latex.template"
+exitcode=$?
+if [[ $exitcode == 0 ]]
+then
+  echo "pandoc worked"
+else
+  echo "pandoc complained"
+  exit $exitcode
+fi
+
 python3 postprocessor.py
 
 # clear && clear