Extension filed but then I do not need to file at all, any issue?

Hi

1. Would there be a problem if I file an extension (I am still waiting for partnership K1s) but let's say that I find out after all income is added that I do not need to file at all, would the extension request without a formal tax filing at a later date create an issue with IRS?
2. What can I do when a partnership is late providing me a K1?
3. If I cannot determine if I have any tax liability until I have all K1s, how can pay figure any estimated taxes due?

Thanks