Parameters and Outputs do not have a default type

[carolynvs]

Describe the bug

When a type is not declared for a parameter or output, our new validation of its jsonschema fails (because it doesn't have a default type).

To Reproduce

1. Create a bundle with a parameter or output and omit the type field.
2. Install the bundle.

Expected behavior

Either the bundle should fail to build, OR porter should default the type to something sensible such as string.

Porter Command and Output

$ porter install -c hello-keyvault hello-keyvault
<TRUNCATED OUTPUT>
execution completed successfully!
Error: 1 error occurred:
        * error: [Getting a single type errored with "this schema has multiple types: <nil>" and getting multiple types errored with "this schema does not have multiple types: <nil>" Getting a single type errored with "this schema has multiple types: <nil>" and getting multiple types errored with "this schema does not have multiple types: <nil>"]

Version

v0.38.4

[carolynvs]

I am going to try defaulting the type to string (unless there is a path specified, then I'll default it to file) and see how that goes.