tryCatch no longer uses global state to pass the target

[fghibellini]

• your "Our contribution guidelines" link in the readme is broken
• passing the error in a global variable should also be avoided (new errors wipe the old ones),
  if needed in the tests a better solution would be to push the errors into a global queue.

[ghost]

Hi @fghibellini, I'm your friendly neighborhood Microsoft Open Technologies, Inc. Pull Request Bot (You can call me MSOTBOT). Thanks for your contribution!

In order for us to evaluate and accept your PR, we ask that you sign a contribution license agreement. It's all electronic and will take just minutes. I promise there's no faxing. https://cla2.msopentech.com.

TTYL, MSOTBOT;

[mattpodwysocki]

@fghibellini looks great, please sign the CLA and we'll get it merged!

[ghost]

@fghibellini, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

Thanks, MSOTBOT;