> +      azureBlob.deleteContainer(containerName);
> +
> +      try {
> +         azureBlob.close();
> +      } catch (IOException e) {
> +         e.printStackTrace();
> +      }
> +   }
> +
> +   public static boolean customImageExists(String storage, String key) {
> +      boolean retval = false;
> +      final AzureBlobClient azureBlob = 
> ContextBuilder.newBuilder("azureblob")
> +              .credentials(storage, key)
> +              .buildApi(AzureBlobClient.class);
> +
> +      if (azureBlob.containerExists("system"))

Just ` return azureBlob.containerExists("system")`; also wrap it in a 
try/finally block to close the context.

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