fix(hooks): guard strings/cat against set -e abort in pre-push (#59)

Add || echo "" fallback to strings and cat command substitutions.
Without this, if strings is not installed (e.g. minimal Docker/CI
images), set -e silently aborts the script with exit 127, blocking
the push with no message.

Author: jdalton

.git-hooks/pre-push

@@ -128,9 +128,9 @@ while read local_ref local_sha remote_ref remote_sha; do
         fi
 
         if [ "$is_binary" = true ]; then
-          file_text=$(strings "$file" 2>/dev/null)
+          file_text=$(strings "$file" 2>/dev/null || echo "")
         else
-          file_text=$(cat "$file" 2>/dev/null)
+          file_text=$(cat "$file" 2>/dev/null || echo "")
         fi
 
         # Check for hardcoded user paths.