Unhelpful error message when java is not installed on macos

[sammko]

macOS has a default java even when java is not installed. The javainfo process tries to get information out of it and naturally fails parsing the expected XML output.

INFO Using version: latest -> 1.19.3
INFO Using account: sammko
Traceback (most recent call last):
  File "/Users/sammko/.local/bin/picomc", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/picomc/__init__.py", line 18, in main
    picomc_cli()
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
         ^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/decorators.py", line 84, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/picomc/cli/utils.py", line 16, in wrapper
    fn(x, *a, **kwa)
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/decorators.py", line 84, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/picomc/cli/utils.py", line 16, in wrapper
    fn(x, *a, **kwa)
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/decorators.py", line 84, in new_func
    return ctx.invoke(f, obj, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/picomc/cli/play.py", line 40, in play
    inst.launch(account, version, verify_hashes=verify)
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/picomc/instance.py", line 127, in launch
    java_info = assert_java(java, vobj.java_version)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/picomc/java/javainfo.py", line 84, in assert_java
    jinfo = get_java_info(java)
            ^^^^^^^^^^^^^^^^^^^
  File "/Users/sammko/.local/pipx/venvs/picomc/lib/python3.11/site-packages/picomc/java/javainfo.py", line 40, in get_java_info
    props = ElementTree.fromstring(xmlstr)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/homebrew/Cellar/python@3.11/3.11.0/Frameworks/Python.framework/Versions/3.11/lib/python3.11/xml/etree/ElementTree.py", line 1339, in XML
    return parser.close()
           ^^^^^^^^^^^^^^
xml.etree.ElementTree.ParseError: no element found: line 1, column 0