Failed to build TypeError exception

The example code should cause `TypeError` exception in dpctl:
```
import numpy
import dpctl.tensor as dpt
obj = dpt.empty((6,), dtype=numpy.object_)
```
but it failed to build the exception due to bellow error:
```
File dpctl/tensor/_usmarray.pyx:193, in dpctl.tensor._usmarray.usm_ndarray.__cinit__()

TypeError: can only concatenate str (not "numpy.dtype[object_]") to str
```