Issue #413 - Add validation/fallback for payloadStartDate and payloadToBlock...

1. Added validations on payLoadToBlock and payLoadStartDate and fallback to defaults to prevent BAD requests
2. Refactor code under searchRanges for better readability and make sure the following
   1. This needed re-testing of the wholes ranges validation and value setting

added Review label

requested review from @mcfarhat

assigned to @mcfarhat

added 4 commits

• 1cf39566 - 1 commit from branch develop
• d09122af - Issue #413 (closed) - Refactor onBlur functionality
• 1f2b415d - Issue #413 (closed) - Add validation/fallback for payloadStartDate and payloadToBlock...
• e328109f - Issue #413 (closed) - Add validation/fallback for payloadFromBlock to prevent bad requests

Compare with previous version

merged