Replace the last of the ad-hoc RuntimeError exceptions

The ArgumentErrors happen at initialization time, so
I'll keep those as-is

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/mogilefs.rb b/lib/mogilefs.rb
index 6f75461..cbfc5da 100644
--- a/lib/mogilefs.rb
+++ b/lib/mogilefs.rb
@@ -16,6 +16,9 @@ module MogileFS
   class ReadOnlyError < Error
     def message; 'readonly mogilefs'; end
   end
+  class EmptyPathError < Error
+    def message; 'Empty path for mogile upload'; end
+  end
 
   class RequestTruncatedError < Error; end
   class InvalidResponseError < Error; end