Do you want the chart ignore whenever there is value = 0 (when you want this, you must be 100% sure, there never will be value 0 measured), or when there is no value (i.e no measurement was made at given date, and the ProbeValue cell is empty)?

To force line graph to interpolate missing data, in source table must be "#N/A" instead of measurement for break date. E.g. in table tRep1 in column ProbeValue use formula
instead.

The only way to have the line graph to have break instead of interpolation I found in google, was to fix it in certain non-dynamic chart.

I'm almost sure I cold make a line graph to have a break instead of interpolation in dynamic graph years ago, but I don't remember anymore how I did it, and I didn't find anything in google too. Maybe it was possible in older versions (used some 15 years ago).