pint.errors.DimensionalityError: Cannot convert from 'meter' to 'dimensionless'

[tve]

When using a gpx file...

Traceback (most recent call last):
  File "/home/tve/Projects/Navigation/gopro-overlay/bin/gopro-dashboard.py", line 124, in <module>
    timeseries.process_deltas(timeseries_process.calculate_gradient(), skip=10)
  File "/home/Projects/Navigation/gopro-overlay/bin/../gopro_overlay/timeseries.py", line 186, in process_deltas
    updates = processor(self.entries[a], self.entries[b], skip)
  File "/home/Projects/Navigation/gopro-overlay/bin/../gopro_overlay/timeseries_process.py", line 64, in accept
    gain = b.alt - a.alt
  File "/usr/lib/python3.10/site-packages/pint/quantity.py", line 1095, in __rsub__
    return -self._add_sub(other, operator.sub)
  File "/usr/lib/python3.10/site-packages/pint/quantity.py", line 115, in wrapped
    return f(self, *args, **kwargs)
  File "/usr/lib/python3.10/site-packages/pint/quantity.py", line 984, in _add_sub
    raise DimensionalityError(self._units, "dimensionless")
pint.errors.DimensionalityError: Cannot convert from 'meter' to 'dimensionless'

Debug:

def calculate_gradient():
    def accept(a, b, c):
        try:
            gain = b.alt - a.alt
            if a.odo and b.odo:
                dist = b.odo - a.odo
                if dist and dist.magnitude > 0:
                    return {"grad": (gain / dist) * 100.0}
        except Exception: print(b.alt, a.alt)

Output:

Processing....
None -0.8 meter
None -0.8 meter
None -0.8 meter
None -0.8 meter
None -0.8 meter
None -0.8 meter
-0.4 meter None
-0.4 meter None
-0.4 meter None
-0.4 meter None
-0.6 meter None
-0.6 meter None
None -0.4 meter
None -0.4 meter
None -0.4 meter
None -0.6 meter
None -0.6 meter
None -0.6 meter
None -0.6 meter
...

Fix:

def calculate_gradient():
    def accept(a, b, c):
        if a.alt is None or b.alt is None:
            return {"grad": 0.0}
        gain = b.alt - a.alt
        if a.odo and b.odo:
            dist = b.odo - a.odo
            if dist and dist.magnitude > 0:
                return {"grad": (gain / dist) * 100.0}

    return accept

[time4tea]

Fixed in 0.47.0