Update fft_bench.py

Provide list of exceptions that triggers customer warning

Author: oleksandr-pavlyk

fft_bench.py

@@ -16,7 +16,7 @@
     import mkl_fft
     import mkl_fft._scipy_fft_backend as sfbn
     scipy.fft.set_global_backend(sfbn)
-except:
+except (ImportError, ModuleNotFoundError, ValueError):
     print("Unable to use mkl_fft as scipy.fft backend")
 
 # Mark which FFT submodules are available...