Issue reading icephys file

[lvsltz]

nwbRead fails on reading icephys files generated with pynwb 2 and hdmf 3.1.1, e.g. this one

Error using strjoin (line 53)
First input must be a string array or cell array of character vectors.

Error in types.untyped.datapipe.BoundPipe (line 43)
                        strjoin(cellfun(@num2str, num2cell(axis)), ', '));

Error in types.untyped.DataPipe (line 91)
                obj.internal = BoundPipe(p.Results.filename, p.Results.path);

Error in io.parseDataset (line 55)
        data = types.untyped.DataPipe('filename', filename, 'path', fullpath);

Error in io.parseGroup (line 22)
    dataset = io.parseDataset(filename, datasetInfo, fullPath, Blacklist);

Error in io.parseGroup (line 38)
    subg = io.parseGroup(filename, group, Blacklist);

Error in io.parseGroup (line 38)
    subg = io.parseGroup(filename, group, Blacklist);

Error in nwbRead (line 59)
nwb = io.parseGroup(filename, h5info(filename), Blacklist);