DownFlowpathLength: additional check if direction fall into nodata #314
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Fix #300
If the value in one pixel of the D8Pointer points into NoData, the tool won't crash but will output wrong result. This PR adds a safeguard to prevent this and inform the user that there is an issue with the input file. Alternativevly, the code could be modified in ordre to ignore such a pixel and consider it as
0but I think that it is better to not silence this kind of issue in a D8 pointer.Also, I didn't edit the message as it is still valid, but it may be more useful to the user if the message included the row and column number of the pixel causing the error.