Found another issue with strict mode

mo

@@ -146,7 +146,7 @@ moCallFunction() {
     moArgs=()
 
     # shellcheck disable=SC2031
-    if [[ -n "$MO_ALLOW_FUNCTION_ARGUMENTS" ]]; then
+    if [[ -n "${MO_ALLOW_FUNCTION_ARGUMENTS-}" ]]; then
         moArgs=$3
     fi
 
@@ -835,15 +835,15 @@ moShow() {
 
     moSplit moNameParts "$1" "."
 
-    if [[ -z "${moNameParts[1]}" ]]; then
+    if [[ -z "${moNameParts[1]-}" ]]; then
         if moIsArray "$1"; then
             eval moJoin moJoined "," "\${$1[@]}"
             echo -n "$moJoined"
         else
             # shellcheck disable=SC2031
-            if [[ -z "$MO_FAIL_ON_UNSET" ]] || moTestVarSet "$1"; then
+            if moTestVarSet "$1"; then
                 echo -n "${!1}"
-            else
+            elif [[ -n "${MO_FAIL_ON_UNSET-}" ]]; then
                 echo "Env variable not set: $1" >&2
                 exit 1
             fi