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

Dima Rifairequested to merge
delrifai/#413_handling_invalid_block_number into develop
  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

Merge request reports