[Bug Fix] Empty bedrock tool arguments

[davide-baldo]

Fix bedrock empty arguments

When bedrock tool argument is empty, avoid parsing it as a JSON.

Type

🐛 Bug Fix
✅ Test

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
litellm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 9, 2025 11:50am

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[davide-baldo]

The mentioned error:

Exception: Unable to convert openai tool calls=[{\'id\': \'tooluse_aSzmtrI_RrSvoSMwI7G1Wg\', \'function\': {\'name\': \'goto\', \'arguments\': \'\'}, \'type\': \'function\'}] to bedrock tool calls. Received error=Expecting value: line 1 column 1 (char 0)\n. Received Model Group=amazon.nova-lite-v1:0\nAvailable Model Group Fallbacks=None', 'type': None, 'param': None, 'code': '500'}}