MAGETWO-38065: /magento_verion exposes too detailed version information

 - return blank page if bad version found

Author: Dale Sikkema

.htaccess

@@ -187,4 +187,4 @@
 ## If running in cluster environment, uncomment this
 ## http://developer.yahoo.com/performance/rules.html#etags
 
-    #FileETag none
+    #FileETag none

app/code/Magento/Version/Controller/Index/Index.php

@@ -9,6 +9,7 @@
 use Magento\Framework\App\Action\Action;
 use Magento\Framework\App\Action\Context;
 use Magento\Framework\App\ProductMetadataInterface;
+use Magento\Framework\Exception\StateException;
 
 /**
  * Magento Version controller
@@ -34,12 +35,16 @@ public function __construct(Context $context, ProductMetadataInterface $productM
      * Sets the response body to ProductName/Major.MinorVersion (Edition). E.g.: Magento/0.42 (Community). Omits patch
      * version from response
      *
+     * @throws StateException
      * @return void
      */
     public function execute()
     {
-        $fullVersion = explode('.', $this->productMetadata->getVersion());
-        $majorMinorVersion = $fullVersion[0] . '.' . $fullVersion[1];
+        $versionParts = explode('.', $this->productMetadata->getVersion());
+        if(!isset($versionParts[0]) || !isset($versionParts[1])) {
+            return ; // Major and minor version are not set - return empty response
+        }
+        $majorMinorVersion = $versionParts[0] . '.' . $versionParts[1];
         $this->getResponse()->setBody(
             $this->productMetadata->getName() . '/' .
             $majorMinorVersion . ' (' .