[Bug]: Client python expect some properties to be defined in the tsp config and crash if they are not

[timotheeguerin]

Describe the bug

Emitter "@typespec/http-client-python" crashed! This is a bug.
Please file an issue at https://github.com/microsoft/typespec/issues

TypeError: Cannot read properties of undefined (reading 'toLowerCase')
    at addDefaultOptions (file:///Users/timotheeguerin/dev/azsdk/typespec/packages/http-client-python/emitter/src/emitter.ts:48:43)
    at Object.$onEmit [as emitFunction] (file:///Users/timotheeguerin/dev/azsdk/typespec/packages/http-client-python/emitter/src/emitter.ts:81:3)
    at runEmitter (file:///Users/timotheeguerin/dev/azsdk/typespec/packages/http-client-python/node_modules/@typespec/compiler/src/core/program.ts:578:7)
    at compile (file:///Users/timotheeguerin/dev/azsdk/typespec/packages/http-client-python/node_modules/@typespec/compiler/src/core/program.ts:252:5)
    at compileOnce (file:///Users/timotheeguerin/dev/azsdk/typespec/packages/http-client-python/node_modules/@typespec/compiler/src/core/cli/actions/compile/compile.ts:65:21)
    at compileAction (file:///Users/timotheeguerin/dev/azsdk/typespec/packages/http-client-python/node_modules/@typespec/compiler/src/core/cli/actions/compile/compile.ts:31:5)

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Library Version                0.3.0
TypeSpec Compiler Version      0.61.0
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1. It shoudln't crash
2. It shouldn't require the properties(don't require the user to fill in tons of config to get the emitter working)

Reproduction

Run tsp compile . --emit "@typespec/http-client-python" in a simple main.tsp file without a tspconfig.yaml

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[msyyc]

Will take an investigation ASAP.