Fix array conversion of the Dashboard and its Components

Do not omit the parameters when converting the dashboard components to
an array. Add an array conversion to the UrlParams class.

refs #6691

library/Icinga/Web/Url.php

@@ -22,7 +22,7 @@ class Url
     /**
      * An array of all parameters stored in this Url
      *
-     * @var array
+     * @var UrlParams
      */
     protected $params;
 
@@ -335,7 +335,7 @@ class Url
      */
     public function getParams()
     {
-        return $this->params;
+        return $this->params->asArray();
     }
 
     /**

library/Icinga/Web/UrlParams.php

@@ -310,6 +310,11 @@ class UrlParams
         }
     }
 
+    public function asArray()
+    {
+        return $this->params;
+    }
+
     public function __toString()
     {
         $parts = array();

library/Icinga/Web/Widget/Dashboard/Component.php

@@ -126,10 +126,9 @@ EOD;
     public function toArray()
     {
         $array = array('url' => $this->url->getPath());
-        foreach ($this->url->getParams() as $key => $value) {
-            $array[$key] = $value;
+        foreach ($this->url->getParams() as $param) {
+            $array[$param[0]] = $param[1];
         }
-
         return $array;
     }