failed to create program based on os2

While creating a new program with os5, the same with os2 fails in a stange way,
which differs from bug report #943.

Typing ```mbed new --mbedlib .``` just does not return on the command line.
Going into explorer unveils that there is indeed activity:
Created the following file structure:

. - mbed - .bld - .rev-65be27845400.zip
- .lock ...
- .mbed

it is no problem to unzip the zip file but mbed for some reason does not do this.
This means that i cannot use os2 with mbed cli.

Urgent help needed as we are going to use plattform not supported by os5 quite soon!!!

I use Python 3.7.1 and mbed 1.10.2.