Empty space after AdMob disappear

I have layout structure:

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" >
  <com.google.ads.AdView 
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   ads:adSize="BANNER"
  />
    
  <LinearLayout style="@style/TitleBar"
   android:layout_width="fill_parent"
   android:layout_height="45dip"
    // title bar
  </LinearLayout>
  
<RelativeLayout
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical"
  // main layout with all needed elements and background!" >
  
</RelativeLayout>
</LinearLayout>

Everything look fine, until my AdMob disappered. Then I can see empty black region with admob size.

UPDATE: my screen shot:

normally I cas see here ad block, but when I get onFailedToReceiveAd(Ad request successful, but no ad returned due to lack of ad inventory.) ad disappers and my layout not fill all screen.