[Form] Added test for "label" option to accept the value "0"
merged branch bschussek/issue6862 (PR #7154)

This PR was merged into the 2.1 branch.

Commits
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00fbb7e [Form] Added test for "label" option to accept the value "0"

Discussion
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[Form] Added test for "label" option to accept the value "0"

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #6862
| License       | MIT
| Doc PR        | -