fix(bedrock): handle None value of "parameters" correctly

[kayoch1n]

Title

fix(bedrock): handle None value of "parameters" correctly

Relevant issues

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Type

🐛 Bug Fix
✅ Test

Changes

Some agent frameworks provide a None value when a tool has no parameters. For example,

{"type":"function","function":{"name":"weather","description":"Get current weather information","parameters":null}}

The bedrock function _bedrock_tools_pt is using dict.get(key, default) which provides a default value only when there is no such key. However, when the key is present and is None, the default value will not be used. In such case, litellm will raise a KeyError when trying to pop $defs from None.

This PR changed the way of bedrock checking parameters, by adding a if-check on parameters and setting the default value

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