Raise proper exception when spectrum is not passed

[msrdinesh]

This pr is to address the issue 206

EDIT: Fixes #206

[pllim]

There are some irrelevant diff in your commit. I think you need to rebase with the latest master upstream. Please let me know if you need help with this. Thanks!

[msrdinesh]

Hii mam, I am new to git, please help me how to do it, or share any reference. Thanks!

[pllim]

You might want to back up your branch before you do this:

git fetch upstream master
git rebase upstream/master
git push -f origin master

[msrdinesh]

Hii @pllim, I rebased my commit. Also, to close the 206, we need to add tests to check whether the exception is raised as you suggested in the comments. If possible please guide me through that also. Thanks!

[pllim]

@msrdinesh , try poke around test_observation.py and see if you can identify an obvious place to insert a test for this. Thanks! 🐱

[msrdinesh]

Hii @pllim, I tried to add the test. There are a couple of errors. Please help me understand where I was wrong. Thanks!

[pllim]

@msrdinesh , I don't think the errors are related to your patch. Please rebase again in accordance to #228 (comment) and see what happens. Thanks!

[msrdinesh]

Wow, it worked like charm! Thank you so much @pllim Please review the pr so, that we can close the issue 206.

[pllim]

LGTM. Thank you so much for your patch and patience!