Do not create error in Symfony Expression Language on missing User Agent

Configuration/Services.yaml

@@ -59,6 +59,7 @@ services:
       $rule: >
           not (context.getAspect("backend.user").isLoggedIn())
           and not (context.getAspect("frontend.preview").isPreview())
+          and request.getHeader("User-Agent")[0]
           and not (request.getHeader("User-Agent")[0] matches "/^TYPO3|TYPO3 linkvalidator/")
           and not (request.getHeader("User-Agent")[0] matches "/Wget|curl|Go-http-client/")
           and not (request.getHeader("User-Agent")[0] matches "/Googlebot|Bingbot|bingbot|Slurp|DuckDuckBot|Baiduspider|YandexBot|Sogou|Exabot|NextCloud-News|Feedly|XING FeedReader|CCBot|SemrushBot|SEOkicks|Twitterbot|Seekport Crawler|SemanticScholarBot|ia_archiver|PaperLiBot|TrendsmapResolver|AhrefsBot|Nuzzel/")

Documentation/Changelog/1.1.6.rst

@@ -0,0 +1,40 @@
+1.1.6
+=====
+
+Breaking
+--------
+
+Nothing
+
+Features
+--------
+
+Nothing
+
+Fixes
+-----
+
+* Do not break Symfony Expression Language in case no user agent is provided.
+  Some requests might ommit the user agent header.
+  The default configuration for tracking pageviews would result in an error raised
+  from Symfony Expression Language.
+
+  This got fixed as the existence is checked first, before comparing against agents
+  that should not be tracked.
+
+  You should check your own rules if you defined any, see: :ref:`pageview` as well as
+  :ref:`recordview`.
+
+  The raised error looks like this on my own website:
+
+   Core: Exception handler (WEB): Uncaught TYPO3 Exception: Argument 2 passed to Symfony\Component\ExpressionLanguage\Node\BinaryNode::evaluateMatches() must be of the type string, null given, called in vendor/symfony/expression-language/Node/BinaryNode.php on line 167 | TypeError thrown in file vendor/symfony/expression-language/Node/BinaryNode.php in line 176. Requested URL: https://daniel-siepmann.localhost/
+
+Tasks
+-----
+
+Nothing
+
+Deprecation
+-----------
+
+Nothing

ext_emconf.php

@@ -11,7 +11,7 @@ $EM_CONF[$_EXTKEY] = [
     'author' => 'Daniel Siepmann',
     'author_email' => 'coding@daniel-siepmann.de',
     'author_company' => '',
-    'version' => '1.1.2',
+    'version' => '1.1.6',
     'constraints' => [
         'depends' => [
             'core' => '',