Hotfix 1.12.6

[garethfuller]

Description

Fixes price fetching when no price information is available from coingecko. The registry refactor introduced a bug where by the prices map would return an empty object for a token it couldn't fetch the price for. Instead it shouldn't inject that token into the prices map at all.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other

How should this be tested?

Please provide instructions so we can test. Please also list any relevant details for your test configuration.

• Check warning is shown on this mainnet pool 0xea39581977325c0833694d51656316ef8a926a62000200000000000000000036

Checklist:

• I have performed a self-review of my own code
• I have commented my code where relevant, particularly in hard-to-understand areas
• My changes generate no new console warnings
• The base of this PR is master if hotfix, develop if not

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