Python(Go) - poetry - NOASSERTION is displayed for PackageLicenseConcluded/PackageLicenseDeclared is displayed even license exists for package

[niruautomation]

@lfpratik
Tool Version Cloned code from main branch of https://github.com/spdx/spdx-sbom-generator on 11-06-2021 and built the tool
Test Repo https://github.com/lfpratik/spdx-poetry-demo
OS Windows 10

1. Followed all prerequisite steps as per https://confluence.linuxfoundation.org/display/PROD/SPDX+-+Python+Module+-+Prerequisites+For+Windows
2. Followed Prerequisite and Steps as per below screenshot
   
3. Execute ./spdx-sbom-generator
4. Observed that NOASSERTION is displayed for PackageLicenseConcluded/PackageLicenseDeclared is displayed even license exists for package
   Example1 When license file exists for root package
   

Example1 When license file exists for package and also value exists in METADATA

[hasnatkscope]

Opened #290 .