Fix unbuffered result set check. (#7)

* Add version test.

* Fix issue.

lib/db/records.rb

@@ -8,7 +8,7 @@ module DB
 	class Records
 		def self.wrap(result)
 			# We want to avoid extra memory allocations when there are no columns:
-			if result.field_count == 0 || result.row_count == 0
+			if result.field_count == 0
 				return nil
 			end
 

test/db/client.rb

@@ -12,6 +12,16 @@
 
 	let(:client) {DB::Client.new(adapter)}
 
+	it "can select version" do
+		context = client.context
+
+		result = context.call("SELECT VERSION()")
+		expect(result).to be_a(DB::Records)
+
+		row = result.rows.first
+		expect(row[0]).to be_a(String)
+	end
+
 	it "can execute multiple queries" do
 		context = client.context