Remove data::RowError,

[panarch]

• Move RowError::NumberOfValuesDifferent to SelectError.
• Remove RowError::ConflictOnEmptyRow by making evaluate module to handle this.
  This ConflictOnEmptyRow error is now just hidden by evaluate and that might be not an ideal solution.
  We need NonEmptyVec struct for this. (Vec<SelectItem> to NonEmptyVec<SelectItem> for projection)

[coveralls]

Pull Request Test Coverage Report for Build 3655086222

• 15 of 15 (100.0%) changed or added relevant lines in 4 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+4.0e**-05%**) to 98.555%

---

Files with Coverage Reduction	New Missed Lines	%
core/src/result.rs	1	69.77%

Totals
Change from base Build 3630622723:	4.0e-05%
Covered Lines:	37317
Relevant Lines:	37864

---

💛 - Coveralls

[ever0de]

Looks good 👍