Only log blob-not-found errors in error case

We recently added these log lines, but we mistakenly did not put them in
the error branch (so they were logging even in the success case).

Co-authored-by: Renee Chu <rchu@pivotal.io>
Co-authored-by: Merric De Launey <mdelauney@pivotal.io>
Co-authored-by: Reid Mitchell <rmitchell@pivotal.io>

Author: 3 people

app/controllers/runtime/helpers/blob_dispatcher.rb

@@ -6,13 +6,17 @@ def initialize(blobstore:, controller:)
     end
 
     def send_or_redirect(guid:)
-      logger.error('No guid for BlobNotFound')
-      raise CloudController::Errors::BlobNotFound unless guid
+      unless guid
+        logger.error('No guid for BlobNotFound')
+        raise CloudController::Errors::BlobNotFound
+      end
 
       blob = @blobstore.blob(guid)
 
-      logger.error('No blob object for BlobNotFound')
-      raise CloudController::Errors::BlobNotFound unless blob
+      unless blob
+        logger.error('No blob object for BlobNotFound')
+        raise CloudController::Errors::BlobNotFound
+      end
 
       send_or_redirect_blob(blob)
     end