fix ZeroDivisionError: float division by zero

[markroxor]

While running python -m line_profiler file_name.py. I get this minor error which can be fixed with a harmless addition of 1e-6.

Traceback (most recent call last):
  File "/Users/mark/miniconda3/envs/.env/lib/python3.5/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/Users/mark/miniconda3/envs/.env/lib/python3.5/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Users/mark/miniconda3/envs/.env/lib/python3.5/site-packages/line_profiler.py", line 422, in <module>
    main()
  File "/Users/mark/miniconda3/envs/.env/lib/python3.5/site-packages/line_profiler.py", line 419, in main
    show_text(lstats.timings, lstats.unit)
  File "/Users/mark/miniconda3/envs/.env/lib/python3.5/site-packages/line_profiler.py", line 259, in show_text
    output_unit=output_unit, stream=stream, stripzeros=stripzeros)
  File "/Users/mark/miniconda3/envs/.env/lib/python3.5/site-packages/line_profiler.py", line 228, in show_func
    '%5.1f' % (100 * time / total_time) )
ZeroDivisionError: float division by zero