The external_coupling_block error does not show the invalid type

Description

A user is trying to run an svMultiPhysics simulation using the svZeroDSolver. The JSON file used for the coupling has a misspelled bc_type which causes the simulation to fail with

ibc++abi: terminating due to uncaught exception of type std::runtime_error: Error: The specified connection type for inlet external_coupling_block is invalid.

This error message does not show what the

1. invalid connection type is
2. valid connection types are

Note that with an informative error message the user could have identified the problem and fixed it rather than posting to the SV Forum for help.

Reproduction

Run a simulation with a misspelled bc_type parameter.

Expected behavior

The error should contain information that would help the user to find and fix the error.

Additional context

There is no documentation that I can see describing what the valid BC types are.

Code of Conduct

• I agree to follow this project's Code of Conduct and Contributing Guidelines

Reproduce the failure by running an svMultiPhysics simulation with a misspelled bc_type in the coupling JSON. Start by tracing the external_coupling_block error handling in svZeroDSolver; the work is done when the error identifies the invalid connection type and lists the valid connection types.