[Misc] Add all xwiki system properties as custom data in GE + tag some of them

* Fix NPE

.mvn/gradle-enterprise-custom-user-data.groovy

@@ -38,19 +38,19 @@ buildScan.executeOnce('tag-profiles') { BuildScanApi buildScanApi ->
     project.properties.find { it.key.startsWith('xwiki') }.each { buildScanApi.value(it.key, it.value) }
 
     // Add specific tags to make it easy to recognize with wich environment a docker functional tests has been executed
-    def servletContainer = project.properties.'xwiki.test.ui.servletEngine'.toLowerCase()
-    def servletContainerTag = project.properties.'xwiki.test.ui.servletEngineTag'.toLowerCase()
+    def servletContainer = project.properties.'xwiki.test.ui.servletEngine'
+    def servletContainerTag = project.properties.'xwiki.test.ui.servletEngineTag'
     if (servletContainer && servletContainerTag) {
-        buildScanApi.tag("${servletContainer} ${servletContainerTag}")
+        buildScanApi.tag("${servletContainer.toLowerCase()} ${servletContainerTag.toLowerCase()}")
     }
-    def database = project.properties.'xwiki.test.ui.database'.toLowerCase()
-    def databaseTag = project.properties.'xwiki.test.ui.databaseTag'.toLowerCase()
+    def database = project.properties.'xwiki.test.ui.database'
+    def databaseTag = project.properties.'xwiki.test.ui.databaseTag'
     if (database && databaseTag) {
-        buildScanApi.tag("${database} ${databaseTag}")
+        buildScanApi.tag("${database.toLowerCase()} ${databaseTag.toLowerCase()}")
     }
-    def browser = project.properties.'xwiki.test.ui.browser'.toLowerCase()
+    def browser = project.properties.'xwiki.test.ui.browser'
     if (browser) {
-        buildScanApi.tag(browser)
+        buildScanApi.tag(browser.toLowerCase())
     }
 
 }