Properly handle an invalid $module parameter.
Merge pull request #1563 from cmfcmf/module-fix

This PR was merged into zikula:1.3 branch.

Discussion
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Properly handle an invalid $module parameter.

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | ---
| Refs tickets  | ---
| License       | MIT
| Doc PR        | ---

Commits
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7876e45b748d87f95a1beff3383c075ae86062bd Properly handle an invalid $module parameter. cmfcmf