Utilities/Release: Enforce macOS signing script arguments later

Make room for alternative sources of information.

Utilities/Release/macos/sign-notarize.bash

@@ -59,16 +59,16 @@ case "$1" in
 esac
 test "$#" = 0 || die "$usage"
 
-# Verify arguments.
-if test -z "$id" -o -z "$keychain_profile"; then
-    die "$usage"
-fi
-
 # Verify environment.
 if ! xcrun --find notarytool 2>/dev/null; then
     die "'xcrun notarytool' not found"
 fi
 
+# Verify arguments.
+if test -z "$id" -o -z "$keychain_profile"; then
+    die "$usage"
+fi
+
 readonly tmpdir="$(mktemp -d)"
 
 # Prepare entitlements.