Check null sentiments when calculating average sentiment

[epipav]

Changes proposed ✍️

• When sentiment is null (possibly can happen with the new integration framework, some LinkedIn integration had null sentiment) member findById was throwing an error - Now we ignore null sentiments from the calculation.

What

🤖 Generated by Copilot at 09ec5c1

Fixed a potential bug in memberRepository.ts that could cause an error when calculating the sentiment score of a member. Added a null check for i.sentiment before accessing its sentiment property.
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🤖 Generated by Copilot at 09ec5c1

i.sentiment check
avoids error in winter
calm sentiment score

Why

How

🤖 Generated by Copilot at 09ec5c1

• Add a null check for i.sentiment before accessing its sentiment property to avoid errors when calculating the average sentiment score of a member's activities (link) in memberRepository.ts

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.