fixing issue #193

[sravotto]

re-adding the defaultConsistentPoint in the logical package.

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This change is 

[bobvawter]

w/ nits

Reviewed 2 of 2 files at r1.
Reviewable status: all files reviewed (commit messages unreviewed), 2 unresolved discussions (waiting on @sravotto)

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internal/source/logical/loop.go line 48 at r1 (raw file):

	// the key used to persist the consistentPoint stamp.
	consistentPointKey string
	// default consistentPoint.

Redundant comment.

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internal/source/logical/loop.go line 96 at r1 (raw file):

		return nil, err
	}
	if len(data) == 0 {

Restructure as

if len(data) == 0 && l.defaultConsistentPoint != "" {
  data = []byte(l.defaultConsistentPoint)
}
return l.dialect.UnmarshalStamp(data)

[sravotto]

Reviewable status: 1 of 2 files reviewed, 2 unresolved discussions (waiting on @bobvawter)

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internal/source/logical/loop.go line 48 at r1 (raw file):

Previously, bobvawter (Bob Vawter) wrote…

Redundant comment.

Done.

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internal/source/logical/loop.go line 96 at r1 (raw file):

Previously, bobvawter (Bob Vawter) wrote…

Restructure as

if len(data) == 0 && l.defaultConsistentPoint != "" {
  data = []byte(l.defaultConsistentPoint)
}
return l.dialect.UnmarshalStamp(data)

Done.