Rewritten assert statements for more explicit checks

[Dhruv276R]

Fixes issue:

• Replace and rewrite "assert" statements in non-test code aboutcode#175

I have changed the assert statements to if and raise statements. It was a good first issue.

[pombredanne]

Can you add a reference link in your commit message before your signoff:
Reference: https://github.com/aboutcode-org/aboutcode/issues/175

[pombredanne]

Thanks, can you amend your commit to add your DCO signoff?

Note that the other test failures may not be your making, but rather because of #576

[Dhruv276R]

@pombredanne
Can you tell me what to do exactly? I am new in open source and willing to make better contributions

[pombredanne]

May be you can extract a variable?

Suggested change

	if len(lic_key) != len(lic_name):
	len_lics = len(lic_key)
	if len_lics != len(lic_name):

and then use it in the messages and other tests below?

[pombredanne]

Thank you! Could you squash your commits, rewrite a proper commit message as explained in our documentation, add your DCO signoff, and force push?

[Dhruv276R]

Yeah I tried that but force pushing didn't seem to work for me. Let me do it again.