Fix black stripes when mosaicing without nodata #219
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When a GeoTIFF doesn't have a nodata value, and we use a VRT, GDAL fills in 0s for pixels outside the bounds. However,
read(masked=True)doesn't mask these 0s, so they're left in as valid data.Using
add_alphain the VRT, we get an extra explicit alpha band to use as the mask.Closes #217.