Fixing potential segfault referencing cuda_cascade
Fixing potential segfault referencing cuda_cascade

This resolves a potential segfault encounted at line 76 where cuda_cascade is an invalid value.
openalpr/openalpr,openalpr/openalpr,openalpr/openalpr,openalpr/openalpr,openalpr/openalpr,openalpr/openalpr,openalpr/openalpr