I have a cascading WMS store with a large amount of cached tiles. The 
source WMS is no longer accessible and when I use the gwc/service/wms 
endpoint access an area that's not cached, I get a ton of errors in my 
geoserver console (see below) and it slows down tile retrieval even if I 
return to an area with cached data.

Is there some way I can make my layer always return the existing cached 
data but avoid going back to the source cascading WMS store if it 
doesn't have a tile?  In other words, can I get the failed/blank tiles 
immediately returned if they're not already available/cached locally?

Any advice is appreciated!  I am on GeoServer 2.2.5.

Thanks!
Ashley

17 Nov 21:20:23 ERROR [geoserver.ows] -
org.geoserver.platform.ServiceException: Internal error
         at org.geoserver.wms.GetMap.run(GetMap.java:121)
         at 
org.geoserver.wms.DefaultWebMapService.getMap(DefaultWebMapService.ja
va:353)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

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