Improve error of empty block queries

[srfrog]

Closes #3006

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This change is 

[danielmai]

Reviewed 1 of 1 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @srfrog)

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query/query.go, line 2539 at r1 (raw file):

			gq.Alias != "shortest" && !gq.IsEmpty) {
			return x.Errorf("Invalid query, no function used at root and no aggregation" +
				" or math variables found in the body.")

This looks good. I'd make this two sentences. "Invalid query. No function ... "

IIRC, there was a change that shows the line/column number of the error in question. This won't have that, right?

[srfrog]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @danielmai)

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query/query.go, line 2539 at r1 (raw file):

Previously, danielmai (Daniel Mai) wrote…

This looks good. I'd make this two sentences. "Invalid query. No function ... "

IIRC, there was a change that shows the line/column number of the error in question. This won't have that, right?

No it wont

[manishrjain]

Good to go from my side, once @danielmai 's comment is addressed and he gives an lgtm.

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @danielmai)

[danielmai]

Reviewable status: complete! all files reviewed, all discussions resolved

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query/query.go, line 2539 at r1 (raw file):

Previously, srfrog (Gus) wrote…

No it wont

Ok. Make it two sentences and then .