Fix exception if module.info contains newlines that are not part of the module's description

fixes #11831

library/Icinga/Application/Modules/Module.php

@@ -671,6 +671,8 @@ class Module
                             $metadata->description .= $line;
                             continue;
                         }
+                    } elseif (empty($line)) {
+                        continue;
                     }
 
                     list($key, $val) = preg_split('/:\s+/', $line, 2);

test/php/regression/Bug11831Test.php

@@ -0,0 +1,37 @@
+<?php
+/* Icinga Web 2 | (c) 2016 Icinga Development Team | GPLv2+ */
+
+namespace Tests\Icinga\Regression;
+
+use ReflectionClass;
+use Icinga\Application\Icinga;
+use Icinga\Application\Modules\Module;
+use Icinga\Test\BaseTestCase;
+
+/**
+ * Regression-Test for bug #11831
+ *
+ * Empty lines in module.info must be ignored if they're not part of the module's description
+ *
+ * @see https://dev.icinga.org/issues/11831
+ */
+class Bug11831Test extends BaseTestCase
+{
+    public function testNewlinesInModuleInfo()
+    {
+        $moduleInfo = <<<'EOT'
+
+version: 1.0.0
+
+EOT;
+        $moduleInfoFile = tmpfile();
+        fwrite($moduleInfoFile, $moduleInfo);
+        $module = new Module(Icinga::app(), 'Bug11831', '/dev/null');
+        $reflection = new ReflectionClass($module);
+        $prop = $reflection->getProperty('metadataFile');
+        $prop->setAccessible(true);
+        $prop->setValue($module, stream_get_meta_data($moduleInfoFile)['uri']);
+        $this->assertEquals($module->getVersion(), '1.0.0');
+        fclose($moduleInfoFile);
+    }
+}