Missing conditional check for Duration

[conveyanand]

Describe the bug
Missing conditional check for Duration

To Reproduce
make_sinc_pulse.py#107
if duration <= 0:
raise ValueError('RF pulse duration must be positive.')

The above validation is not available in other similar files.

Expected behavior
Consistent validation across the files

Screenshots

Desktop (please complete the following information):
Not Applicable

Additional context
Please check screenshot for affected files and perform a thorough search for any other instances.