Fix the possibly-used-before-assignment in pylint

[1ucian0]

In #12520 @jakelishman mentioned that would be great to enable possibly-used-before-assignment introduced in pylint 3.2

Here it is.

[qiskit-bot]

One or more of the following people are relevant to this code:

• @enavarro51
• @Qiskit/terra-core
• @ajavadia
• @levbishop
• @mtreinish
• @nkanazawa1989
• @t-imamichi

[coveralls]

Pull Request Test Coverage Report for Build 9467737904

Details

• 19 of 25 (76.0%) changed or added relevant lines in 7 files are covered.
• 17 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.03%) to 89.579%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit/qpy/binary_io/circuits.py	0	1	0.0%
qiskit/transpiler/passes/optimization/commutative_cancellation.py	0	1	0.0%
qiskit/visualization/circuit/matplotlib.py	0	1	0.0%
qiskit/quantum_info/operators/operator.py	6	9	66.67%

Files with Coverage Reduction	New Missed Lines	%
crates/qasm2/src/parse.rs	6	97.61%
crates/qasm2/src/lex.rs	11	91.86%

Totals
Change from base Build 9455662900:	-0.03%
Covered Lines:	62508
Relevant Lines:	69780

---

💛 - Coveralls

[jakelishman]

Thanks for looking at this!

[coveralls]

Pull Request Test Coverage Report for Build 9495986714

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 21 of 24 (87.5%) changed or added relevant lines in 7 files are covered.
• 74 unchanged lines in 7 files lost coverage.
• Overall coverage decreased (-0.02%) to 89.586%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit/qpy/binary_io/circuits.py	0	1	0.0%
qiskit/transpiler/passes/optimization/commutative_cancellation.py	0	1	0.0%
qiskit/visualization/circuit/matplotlib.py	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
qiskit/circuit/parameterexpression.py	2	96.54%
qiskit/quantum_info/operators/operator.py	3	94.14%
crates/qasm2/src/parse.rs	6	97.61%
qiskit/user_config.py	8	88.54%
crates/qasm2/src/lex.rs	9	92.62%
qiskit/visualization/circuit/circuit_visualization.py	23	73.43%
qiskit/circuit/quantumcircuit.py	23	95.84%

Totals
Change from base Build 9455662900:	-0.02%
Covered Lines:	62523
Relevant Lines:	69791

---

💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 9496759963

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 21 of 27 (77.78%) changed or added relevant lines in 8 files are covered.
• 65 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.01%) to 89.596%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit/primitives/backend_estimator.py	0	1	0.0%
qiskit/qpy/binary_io/circuits.py	0	1	0.0%
qiskit/visualization/circuit/matplotlib.py	0	1	0.0%
qiskit/transpiler/passes/optimization/commutative_cancellation.py	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
qiskit/circuit/parameterexpression.py	2	96.54%
qiskit/quantum_info/operators/operator.py	3	94.14%
crates/qasm2/src/lex.rs	6	92.88%
qiskit/user_config.py	8	88.54%
qiskit/visualization/circuit/circuit_visualization.py	23	73.43%
qiskit/circuit/quantumcircuit.py	23	95.84%

Totals
Change from base Build 9455662900:	-0.01%
Covered Lines:	62531
Relevant Lines:	69792

---

💛 - Coveralls