Merge pull request #205 in CASA/casa6 from CAS-13136 to master
* commit '675d8c27ddb76a36d018ead5933ab575b4ee1ce8':
changed a condition from "anyNE" (nonzero) to "anyGT" (positive) CAS-13136 avoid substituting negative value to size_t CAS-13136 better formatting CAS-13136 more emphasis on doing nothing for empty Tsys/Tcal
Updated logic: replaced logical AND with logical OR
Fixed indexing bug CAS-13136 more robust logic to check if Tsys/Tcal is effectively spectral or scalar
Fix typo