Remove assert causing syntax error.

[ktbolt]

See Issue SimVascular/svZeroDSolver#77.

[mrp089]

@ktbolt, if you look at the git blame, there was a reason for these asserts (see #74). This error could be triggered by wrong user input, so I don't think it's a good idea to just delete statements that are supposed to catch errors.

Can you throw an error instead if you don't like assert statements?

[ktbolt]

@mrp089 Asserts are used for testing and not for production. I'll replace them with exceptions.

[ktbolt]

I've replaced the asserts with exceptions.

Note that asserts are disabled for a Release build so now these checks will cause the code to fail.