fix: user can check --help even without valid URI #5
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To create a client to make operations, we need
a valid service URI.
Before an invalid service URI exits the program
and show a message for the user to fix the URI.
This way, the user can not see the help command
information from the CLI itself even before deci-
ding to use.
I am creating the client at function level.
Creating a client for every function call is
not the right approach. But for a purpose demo,
seems reasonable.
This way the user can check the --help function
before deciding to use the tool.
Fixes #4