[FIX] Pylint fixing <sale_documents_comments>
[FIX] Pylint fixing <warning_log>
[FIX] Pylint fixing <stock_invoicing_type>
[FIX] Pylint fixing <product_pricelist_import>
[FIX] Pylint fixing <mrp_bom_catch_product_code>
[FIX] Pylint fixing <task_delegation_wizard>
[FIX] Pylint fixing <stock_inventory_preparation_filters>
[FIX] Pylint fixing <mrp_operations_extension>
[FIX] Pylint fixing <mrp_bom_version>
[FIX] Pylint fixing <mrp_production_project_estimated_cost>
[FIX] Pylint fixing <quality_control>
[FIX] Pylint fixing <mrp_wizard_filter_task>
[FIX] Pylint fixing <product_purchase_warrant>
[FIX] Pylint fixing <quality_control_samples>
[FIX] PEP8 fixed
Merge pull request #322 from oihane/8.0-fixing_pylint

[FIX] Pylint fixing