Might be related to #28
Currently, if a step has a directory as an input file, and that directory is empty, Drake will say that there is no input data at that location (at least, this is how it works for HDFS directories).
drake: no input data found in locations: hdfs:/input/dir
For my workflow, an empty directory is fine and indicates that the output was created but just doesn't have any data.
Would be great if
(1) an empty directory could be treated as a valid input file, or
(2) there is a flag to indicate that empty directories are ok as inputs.
I'm willing to make the patch for this