[Propel1Bridge][ModelChoiceList] add exception message for invalid classes
bug #9933 Propel1 exception message (jaugustin)

This PR was merged into the 2.3 branch.

Discussion
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Propel1 exception message

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9932
| License       | MIT
| Doc PR        | none

This add exception message for `ModelChoiceList` and `ModelType` when `class` parameter is not provided or invalid

Commits
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047492f [Propel1Bridge][ModelChoiceList] add exception message for invalid classes