mblist command doesn't like filenames with spaces

[asmith26]

Describe the bug
Running the mblist command doesn't seem to like filenames with whitespace.

To Reproduce

mblist -I my_data.gsf    # works fine (when the filename uses an underscore instead of a whitespace)
mblist -I "my data.gsf"  # yields below error
mblist -I my\ data.gsf   # yields below error

Error:

MBIO Error returned from function <mb_read_init>:
Illegal format identifier, initialization failed

Multibeam File <my> not initialized for reading

Program <MBLIST> Terminated

Computing context (please complete the following information):

• OS: Linux/Ubuntu 16.04
• MB-system Version: 5.7.6beta26
• GMT version: 6.0.0

Additional context
I thought I'd raise this in case I'm doing something wrong. Many thanks for any help and this library :)