Advanced search query input needs to be updated

[jabrah]

• [x] Show 3 empty query terms by default
  • Make sure that the Clear button restores 3 empty terms
• [ ] Update validation logic (currently pretty broken)
  • [x] Need validation for proximity search terms: make sure "Range" is an INT value, term1 and term2 should be made required
  • Empty terms should be ignored when clicking the Search button
  • We can use basic HTML validation when needed