Merge pull request #710 from RocketPy-Team/bug/zero-mass-is-not-none

BUG: Fix Motor Zero Dry Mass Check

Author: phmbressan

CHANGELOG.md

@@ -50,6 +50,7 @@ Attention: The newest changes should be on top -->
 
 ### Fixed
 
+- BUG: Fix Motor Zero Dry Mass Check [#710](https://github.com/RocketPy-Team/RocketPy/pull/710)
 - BUG: Fix Environment.max_expected_height for custom atmosphere [#707](https://github.com/RocketPy-Team/RocketPy/pull/707)
 - BUG: Initialize _Controller Init Parameters [#703](https://github.com/RocketPy-Team/RocketPy/pull/703)
 - BUG: Rail Buttons Not Accepted in Add Surfaces [#701](https://github.com/RocketPy-Team/RocketPy/pull/701)

rocketpy/motors/motor.py

@@ -370,7 +370,7 @@ def dry_mass(self, dry_mass):
         dry_mass : float
             Motor dry mass in kg.
         """
-        if dry_mass:
+        if dry_mass is not None:
             if isinstance(dry_mass, (int, float)):
                 self._dry_mass = dry_mass
             else: