addresses active reported issues as reported by CodeQL #233
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Issues addressed within this PR:
222 Unused import - file: tools/picklescanner.py
223 Unused import - file: skip.py
224 Missing call to init - file: issues.py
225 Potentially uninitialized local variable - file: cli.py
226 File is not always closed- file: cli.py
227 File is not always closed - file: model.py