Fixed GeoArray.is_map_geo not containing a bool.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

geoarray/baseclasses.py

@@ -330,7 +330,7 @@ class GeoArray(object):
 
     @property
     def epsg(self):
-        # type: (None) -> int
+        # type: () -> int
         """Get the EPSG code of the projection of the GeoArray."""
         return WKT2EPSG(self.projection)
 
@@ -348,9 +348,9 @@ class GeoArray(object):
     def is_map_geo(self):
         # type: () -> bool
         """
-        Returns 'True' if the GeoArray instance has a valid geoinformation with map instead of image coordinates.
+        Return 'True' if the GeoArray instance has a valid geoinformation with map instead of image coordinates.
         """
-        return self.gt and list(self.gt) != [0, 1, 0, 0, 0, -1] and self.prj
+        return all([self.gt, list(self.gt) != [0, 1, 0, 0, 0, -1], self.prj])
 
     @property
     def nodata(self):