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Adrien authored
* in Parameter editor, DataExpressionEditor and contractInputEditor, when the viewer didn't have any element selected, return type was set at null because of some databinding. It had consequences on other editors, especially if return type is fixed. -> when viewer doesn't have any element selected, we don't do anything now, so returnTypeObservable is preserved closes [BS-17093](https://bonitasoft.atlassian.net/browse/BS-17093)
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