Empty device names break DataNamer

[calebjordan]

If a file named something like 0.h5 is present in a data folder, DataNamer.m will fail at parsing it with regexp.

Qlab/common/util/DataNamer.m

Line 34 in b217fc4

tokens = regexp({fileList.name}, '(\d+)_.*\.h5', 'tokens', 'once');

I may submit a PR fixing this later today.

[caryan]

We always take PRs 😄