simple concenation results in parsing error, concenate null values as empty string

[doczoidberg]

I still have many issues with HF. It is a mess to debug.
e.g. I have to go through all references here:

=C1198&";"&D1198&";"&E1198&";"&F1198&";"&G1198&H1198&":"&I1198&":"&J1198&";"&K1198&":"&L1198&":"&M1198&";"&N1198&";"&O1198&";"&P1198&";"&Q1198&";"&R1198&";"&S1198&";"&T1198&";"&U1198&";"&V1198&";"&W1198&";"&X1198&";"&Y1198

DetailedCellError {value: "#ERROR!", type: "ERROR", message: "Parsing error"}
message: "Parsing error"
type: "ERROR"
value: "#ERROR!"
__proto__: Object

[doczoidberg]

one can't concenate null values.

This should be used like an empty string?

[wojciechczerniak]

Should be fixed in #499

[doczoidberg]

good work!