allow wkcuber.tile_cubing to use zero indexed tile locations (#823)

when using the --input_path_pattern option

removes an assert that failed only when an index was zero
importing with zero indexed paths where eg. {z}/{x}_{y}.tiff is in the
range of [1..99]/[0..8]_[0..7].tiff would fail as the assert would
trigger
importing a zero indexed works fine with this assert removed, there is
no reason to require this to not be zero

Author: thopp-tudelft

wkcuber/wkcuber/tile_cubing.py

@@ -145,7 +145,6 @@ def detect_interval_for_dimensions(
                             idx : idx + current_decimal_length[current_dimension]
                         ]
                         coordinate_value = int(coordinate_value_str)
-                        assert coordinate_value
                         min_dimensions[current_dimension] = min(
                             min_dimensions.get(current_dimension, coordinate_value),
                             coordinate_value,