Fix Hybrid A*

[guilyx]

Fix issue #325

[AtsushiSakai]

Thank you!! Is it possible to add a test? It is ok just adding a new test code "test_hybrid_a_star.py" in the tests dir.
a_star test code might help: https://github.com/AtsushiSakai/PythonRobotics/blob/master/tests/test_a_star.py

[lentychang]

Hi @guilyx ,

Since N_STEER is declared line27 and is only used in this function, would it be better to change line 27 from N_STEER=20.0 to N_STEER = 20 instead?

[guilyx]

@lentychang indeed !

[guilyx]

Added the tests and changed N_STEER according to @lentychang's suggestion.
@AtsushiSakai as E722 do not use bare 'except and all the tests uses bare excepts there might be something to do.

[AtsushiSakai]

@guilyx @lentychang Thank you guys!!. I will merge it.

all the tests uses bare excepts there might be something to do.

Oh. Yes. these codes should do it. That's why I'm using incremental code check : ).