Update account_parameter.go

[Richard-Barrett]

Fixes #1679

• Added error handling to check if defaultValue is nil.
• Added error statements to provide better insight into what’s happening when the account parameter is being reset.
• More detailed error messages to give you more context when debugging.

Test Plan

• acceptance tests

• …

References

[sfc-gh-asawicki]

This check is incorrect. There are parameters which default to none value (e.g. https://docs.snowflake.com/en/sql-reference/parameters#query-tag).