Fix package command behaviour

[ziopio]

Print the help text if no subtask is provided

% rebar3 grisp package     
===> Analyzing applications...
===> Compiling grisp_tools
===> Compiling textual
===> Compiling grid
===> Compiling rebar3_grisp
===> Analyzing applications...
===> Compiling grisp_tools
===> Compiling textual
===> Compiling grid
===> Compiling rebar3_grisp
Pre-built packages tasks

Commands:
  list          List packages

Usage: rebar3 grisp package [-p [<platform>]] [-c <columns>] [-t [<type>]]
                            [-c [<cached>]]

  -p, --platform  Platform to list packages for [default: grisp2]
  -c, --columns   List columns to display
  -t, --type      Package type [default: otp]
  -c, --cached    List only cached packages [default: false]

Fixes #77

[GwendalLaurent]

When I compile rebar3_grisp I get this warning:

===> Compiling rebar3_grisp
     ┌─ _checkouts/rebar3_grisp/src/rebar3_grisp_package.erl:
     │
 111 │  task_run(Task, _Args, RState) ->
     │           ╰── Warning: variable 'Task' is unused

Maybe we should add: dialyzer({nowarn_function, task_run/3}). or delete the function if we really don't need it

[ziopio]

That is a compiler warning, what does dialyzer have to do with it?

[GwendalLaurent]

ah mb, there is an option for the compiler as well. And the warning was on the variable and not the function I misread the whole error