FIO-8402: fixed an issue where Validation Triggering on initial Form load

[KatrinKhilko]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-8402

Description

What changed?

The issue was caused by calculated values, form load use onChange method that performs calculation and set pristine flag to false even if form wasn't initialized and user hasn't made any changes. Choose adding check for form initialization.

Dependencies

n/a

How has this PR been tested?

Tested manually, all unit/integration tests pass locally

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• My changes include tests that prove my fix is effective (or that my feature works as intended)
• New and existing unit/integration tests pass locally with my changes
• Any dependent changes have corresponding PRs that are listed above

[brendanbond]

Why can't we write tests for this? Even though it's a relatively simple change, a test or two would define the expected behavior of our program for developers and prevent regressions. It's also a good opportunity to test your assumptions to make sure there are no edge cases that haven't been considered.