Add no media store for sandbox

[Doug Palmer]

The sandbox might be better off not storing thousands of images in a local store. The current options available are a local media store or a remote media store but no null-op media store.

See also #316

[Peter Ansell]

Confirmed:

biocache-store/src/main/scala/au/org/ala/biocache/Config.scala

Lines 47 to 58 in da151fc

 //URL to an instance of the ALA image-service 
 val remoteMediaStoreUrl = configModule.properties.getProperty("media.store.url", "") 
  
 val mediaStore = { 
   if(StringUtils.isBlank(remoteMediaStoreUrl)){ 
     logger.debug("Using local media store") 
     LocalMediaStore 
   } else { 
     logger.debug("Using remote media store") 
     RemoteMediaStore 
   } 
 } 

Sorry, I misunderstood earlier what would happen when the remote media URL was not specified, it doesn't seem to currently have a configuration setting to skip all media loading.

[Doug Palmer]

Fixed in #319