Empty inputs should not be allowed

[nromashchenko]

Version: 2.1.1

omamer doesn't check if the input file provided by -q is empty, and crashes with:

Traceback (most recent call last):
  File "/home/nikolai/dev/omamer/.pixi/envs/default/bin/omamer", line 33, in <module>
    sys.exit(load_entry_point('omamer', 'console_scripts', 'omamer')())
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/nikolai/dev/omamer/omamer/main.py", line 306, in main
    args.func(args)
  File "/home/nikolai/dev/omamer/omamer/_runners.py", line 256, in search
    search_rate = sum(map(lambda x: x[0], search_times)) / sum(
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ZeroDivisionError: division by zero