Guard against empty or whitespace-only input in parseText()

When parseText() is called with an empty or whitespace-only string,
similarity matching against templates via similar_text() produces
undefined/meaningless scores and brute-force matching wastes cycles.
Return early with an empty ParseResult and log a warning instead.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aymanrb

src/TextParser.php

@@ -44,6 +44,12 @@ public function parseText(string $text, bool $findMatchingTemplate = false): Par
     {
         $this->resetParseResults();
 
+        if (trim($text) === '') {
+            $this->logger->warning('parseText called with empty or whitespace-only text, skipping parsing');
+
+            return $this->parseResults;
+        }
+
         $parsableTemplates = $this->templatesHelper->getTemplates($text, $findMatchingTemplate);
 
         foreach ($parsableTemplates as $templatePath => $templatePattern) {