Fix document link gem paths when to_spec returns nil

[vinistock]

Motivation

Gem::Specification#to_spec may return nil under certain situations. For example, if the gem installation is missing because the current platform is not supported. We had a few cases of this happening in telemetry.

Implementation

We just need to skip if to_spec returns nil since we have no way of inspecting any other information about that gem.

Automated Tests

Added a test using a simple stub. Creating a super realistic test scenario involves a lot of setup.

[vinistock]

• Fix document link gem paths when to_spec returns nil #4060 👈 (View in Graphite)
• main

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