Unchecked calls to getField(), getSubField(), etc.

[mdavidsaver]

This module needs to be audited for unchecked calls to methods which can return NULL. This is especially problematic in the isCompatible() methods which are intended to be used on suspect type definitions.

normativeTypesCPP/src/ntndarray.cpp

Line 352 in 5e151c3

StructureArrayConstPtr attributeField = structure->getField<StructureArray>( "attribute");

cf. areaDetector/ADCore#296

[mdavidsaver]

The specific issue with NTNDArray is fixed by 91c5136. I'm going to leave this issue open pending a audit for similar issues.