New equation crashes SessionVisualizer

[jerryepratt]

If you create an equation and plot the variable. Then close the SessionVisualizer. Then reload the data, it crashes.

[jerryepratt]

Here is a YoEquation.scs2.yoEquation that give a problem:

`



a

false

0.0
1.0



a = b + c

`Here's the exception that gets thrown:

java.lang.RuntimeException: Failed to build the equation: a = b + c, missing inputs: [b, c]
at us.ihmc.scs2.symbolic.Equation.checkBuildStatus(Equation.java:184)
at us.ihmc.scs2.symbolic.Equation.reset(Equation.java:169)
at us.ihmc.scs2.symbolic.YoEquationManager.reset(YoEquationManager.java:167)
at us.ihmc.scs2.session.Session.initializeRunTick(Session.java:1696)
at us.ihmc.scs2.session.Session.runTick(Session.java:1645)
at us.ihmc.scs2.session.Session$PeriodicTaskWrapper.singleExecuteAndSleep(Session.java:2669)
at us.ihmc.scs2.session.Session$PeriodicTaskWrapper.run(Session.java:2653)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:833)

If I delete the yoEquation file, then things work again.

[jerryepratt]