system-info fails if docker is not installed

[ahankinson]

If I run qlever system-info without docker installed, I get the following output:

Invoking command `system-info` without a Qleverfile. You have to specify all required arguments on the command line. This is possible, but not recommended.

Command: system-info

Show system information and Qleverfile

System Information
------------------

Version: 0.5.33 (qlever --version)
OS: Linux (Fedora Linux 42 (Cloud Edition))
Arch: x86_64
Host: nnnnnnnnnnnnnnnnnnnnnnnnn
RAM: 15.6 GB total, 14.7 GB available
CPU: 8 Cores, 8 Threads @ 0.00 GHz
CWD: /home/fedora
Disk space in /dev/vda5 @ /home is (btrfs): NN GB free / NN GB total
User and group on host: uid=0(root) gid=0(root) groups=0(root)
An unexpected error occurred: /usr/sbin/bash: line 1: docker: command not found

Traceback (most recent call last):
  File "/root/.local/share/pipx/venvs/qlever/lib64/python3.13/site-packages/qlever/qlever_main.py", line 38, in main
    command_successful = command_object.execute(args)
  File "/root/.local/share/pipx/venvs/qlever/lib64/python3.13/site-packages/qlever/commands/system_info.py", line 118, in execute
    user_info = Containerize.run_in_container("id", args).strip()
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/root/.local/share/pipx/venvs/qlever/lib64/python3.13/site-packages/qlever/containerize.py", line 159, in run_in_container
    return run_command(run_cmd, return_output=True)
  File "/root/.local/share/pipx/venvs/qlever/lib64/python3.13/site-packages/qlever/util.py", line 75, in run_command
    raise Exception(result.stderr.replace("\n", " ").strip())
Exception: /usr/sbin/bash: line 1: docker: command not found

Qlever runs fine (I built and run it locally with the following in my Qleverfile):

[runtime]
SYSTEM = system

Weirdly, if I pass the path to my Qleverfile it works, but it says I don't have a Qleverfile!

$ qlever --qleverfile /opt/qlever/qlever-indices/nnnn/Qleverfile system-info

Command: system-info

Show system information and Qleverfile

System Information
------------------

Version: 0.5.33 (qlever --version)
OS: Linux (Fedora Linux 42 (Cloud Edition))
Arch: x86_64
Host: nnnnnnnnnnnnnn
RAM: 15.6 GB total, 14.8 GB available
CPU: 8 Cores, 8 Threads @ 0.00 GHz
CWD: /home/fedora
Disk space in /dev/vda5 @ /home is (btrfs): NNNN GB free / NNNN GB total
User and group on host: uid=0(root) gid=0(root) groups=0(root)

Contents of Qleverfile
----------------------

No Qleverfile found