Merge pull request #61 from DeepBlueRobotics/fix-sim-fail-with-old-lib199

Prevent simulation from failing if using a lib199 version that doesn't support absolute encoders.

Author: brettle

src/main/java/org/carlmontrobotics/subsystems/Arm.java

@@ -464,6 +464,9 @@ public void setDefaultCommand(TeleopArm teleopArm, Object object) {
     @Override
     public void simulationPeriodic() {
         // Fake goaling to the goal instantaneously
-        rotationsSim.set((goalState.position + armMasterEncoder.getZeroOffset()) / armMasterEncoder.getPositionConversionFactor());
+        if (rotationsSim != null) {
+            rotationsSim.set((goalState.position + armMasterEncoder.getZeroOffset())
+                    / armMasterEncoder.getPositionConversionFactor());
+        }
     }
 }