Shouldn't
FAMIXBehaviouralEntity>>computeNumberOfLinesOfCode self hasSourceAnchor ifTrue: [ ^ self sourceAnchor lineCount ].
^ (self sourceText lineCount = '') ifTrue: [ self notExistentMetricValue ] ifFalse: [ self sourceText lineCount ]
be
computeNumberOfLinesOfCode self hasSourceAnchor ifTrue: [ ^ self sourceAnchor lineCount ]. ^ (self sourceText = '') ifTrue: [ self notExistentMetricValue ] ifFalse: [ self sourceText lineCount ]