Added tests for the situations where a citizen has already attempted to sign the proposal and the existing signature is at the state 'invalid return', 'too late' or 'repeated_returning'.
Added tests for the situations where a citizen has already attempted to sign the proposal and the existing signature is at the state 'invalid return', 'too late' or 'repeated_returning'.

avoinministerio/avoinministerio,avoinministerio/avoinministerio