pki ca-kraconnector-show command should display usage when no parameters or invalid parameters are provided

[kimettog]

Summary :
pki ca-kraconnector-show --help command should display usage when no parameters or invalid parameters are provided

Build:
Fedora release 42 (Adams)
dogtag-pki-11.7.0-0.1.alpha1.20250617181155UTC.9f944cd4.fc42.x86_64
COPR: @pki/master

Steps to reproduce:

1. Install necessary dogtag pki pakages
2. Install CA and KRA subsystems
3. Run the command to get usage with --help

pki -d /opt/pki/certdb -P http -p 20080 -h pki1.example.com -c
                SECret.123 -n "PKI CA Administrator for Example.Org" ca-kraconnector-show --help

Usage is provided correctly
4. Now give no parameter or bogus input eg "ASDF' instead of "--help"

Expected:
Expected that the command would provide command usage as it does for "--help"

# pki -d /opt/pki/certdb -P https -p 20443 -h pki1.example.com -c SECret.123 -n "PKI CA Administrator for Example.Org" ca-kraconnector-show --help
usage: ca-kraconnector-show [OPTIONS...]
    --debug     Run in debug mode.
    --help      Show help message.
 -v,--verbose   Run in verbose mode.

Actual :
The command tries to execute with " " or invalid input params giving misleading error

`pki -d /opt/pki/certdb -P https -p 20443 -h pki1.example.com -c SECret.123 -n "PKI CA Administrator for Example.Org" ca-kraconnector-show asdf`
ConnectorNotFoundException: No KRA connectors

 pki -d /opt/pki/certdb -P https -p 20443 -h pki1.example.com -c SECret.123 -n "PKI CA Administrator for Example.Org" ca-kraconnector-show
ConnectorNotFoundException: No KRA connectors

[gkimetto]

Ticket Created RHCS-6007