Log out errors when null docs are encountered

services/docstore/app/coffee/HttpController.coffee

@@ -22,6 +22,8 @@ module.exports = HttpController =
 			for doc in docs
 				if doc? # There can end up being null docs for some reason :( (probably a race condition)
 					docViews.push HttpController._buildDocView(doc)
+				else
+					logger.error err: new Error("null doc"), project_id: project_id, "encountered null doc"
 			res.json docViews
 
 	updateDoc: (req, res, next = (error) ->) ->

services/docstore/test/unit/coffee/HttpControllerTests.coffee

@@ -47,6 +47,7 @@ describe "HttpController", ->
 				.should.equal true
 
 	describe "getAllDocs", ->
+		describe "normally", ->
 			beforeEach ->
 				@req.params =
 					project_id: @project_id
@@ -84,6 +85,50 @@ describe "HttpController", ->
 					}])
 					.should.equal true
 
+		describe "with a null doc", ->
+			beforeEach ->
+				@req.params =
+					project_id: @project_id
+				@docs = [{
+					_id: ObjectId()
+					lines: ["mock", "lines", "one"]
+					version: 1
+					rev: 2
+				},
+				null,
+				{
+					_id: ObjectId()
+					lines: ["mock", "lines", "two"]
+					version: 3
+					rev: 4
+				}]
+				@DocManager.getAllDocs = sinon.stub().callsArgWith(1, null, @docs)
+				@HttpController.getAllDocs @req, @res, @next
+
+			it "should return the non null docs as JSON", ->
+				@res.json
+					.calledWith([{
+						_id:   @docs[0]._id.toString()
+						lines: @docs[0].lines
+						rev:   @docs[0].rev
+						version: @docs[0].version
+					}, {
+						_id:   @docs[2]._id.toString()
+						lines: @docs[2].lines
+						rev:   @docs[2].rev
+						version: @docs[2].version
+					}])
+					.should.equal true
+
+			it "should log out an error", ->
+				@logger.error
+					.calledWith(
+						err: new Error("null doc")
+						project_id: @project_id
+						"encountered null doc"
+					)
+					.should.equal true
+
 	describe "updateDoc", ->
 		beforeEach ->
 			@req.params =