Warning if 0 is passed in numbers_list in NumberPartition problem

[vishal-ph]

Prerequisites

Before raising this issue, I have already checked that I am:

• running the latest version
• made sure that this issue has not already been filed

Describe the bug

Upon creating an instance of the NumberPartition problem with a 0 entry in the list, the problem is created with redundant qubit and terms. These terms then manifest as extra cost gates with angle=0.

To Reproduce

Steps to reproduce the behavior:

from openqaoa.problems import NumberPartition
np = NumberPartition([0,2,3,5,8])
np_qubo = np.qubo()
np_qubo.hamiltonian.expression

Expected behavior

The problem class should catch 0 in the list and raise a warning while removing the zero from the list, and create a problem with the remaining qubits.

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Additional context

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[lumapools]

Hi, I just created a PR that handles this issue. Could a maintainer please assign me to this ?
(I had to close the previous PR as it contained a different not-yet-merged PR modifications)