nixos-anywhere: fix Bash quitting before throwing proper error message

Author: Enzime

src/nixos-anywhere.sh

@@ -525,11 +525,14 @@ importFacts() {
   # shellcheck disable=SC2046
   export $(echo "$filteredFacts" | xargs)
 
+  # Necessary to prevent Bash erroring before printing out which fact had an issue
+  set +u
   for var in isOs isArch isInstaller isContainer hasIpv6Only hasTar hasCpio hasSudo hasDoas hasWget hasCurl hasSetsid; do
     if [[ -z ${!var} ]]; then
       abort "Failed to retrieve fact $var from host"
     fi
   done
+  set -u
 }
 
 checkBuildLocally() {