Handle case where subscribers count is not available

app/src/main/res/layout/channel_header.xml

@@ -61,7 +61,7 @@
             android:layout_below="@+id/channel_title_view"
             android:ellipsize="end"
             android:gravity="left|center"
-            android:lines="1"
+            android:maxLines="2"
             android:textSize="@dimen/channel_subscribers_text_size"
             android:visibility="gone"
             tools:ignore="RtlHardcoded"

app/src/main/res/values/strings.xml

@@ -249,6 +249,7 @@
         <item quantity="one">%s subscriber</item>
         <item quantity="other">%s subscribers</item>
     </plurals>
+    <string name="subscribers_count_not_available">Subscribers count not available</string>
 
     <string name="no_views">No views</string>
     <plurals name="views">