mvnix-init does not handle versions like (3.12.0,)

[ngiger]

I tried mvnix-iinit for our Eclipse RCP app Elexis (https://github.com/elexis/elexis-3-core)

The build fails with

<...>
/nix/store/czsmcxjwj13ik2jx1pkvbsq8rhf8c72i-build-maven-repository.sh: line 6245: syntax error near unexpected token `)'
<...>

which is

dir=$out/$(echo org.eclipse.platform | sed 's|\.|/|g')/org.eclipse.osgi/[3.12.0,)