Rework handling of missing stream object for copy ops

This version works better (doesn't throw) but also doesn't report
any error, which is not good

Author: Sandro Santilli

lib/query.js

@@ -17,7 +17,7 @@ var Query = function(config, values, callback) {
   this.types = config.types;
   this.name = config.name;
   this.binary = config.binary;
-  this.stream  = config.stream;
+  this.stream = config.stream;
   //use unique portal name each time
   this.portal = config.portal || ""
   this.callback = config.callback;
@@ -171,10 +171,17 @@ p.prepare = function(connection) {
 };
 p.streamData = function (connection) {
   if ( this.stream ) this.stream.startStreamingToConnection(connection);
-  else this.handleError(new Error('No destination stream defined'));
+  else {
+    connection.endCopyFrom(); // send an EOF to connection
+    // TODO: signal the problem somehow
+    //this.handleError(new Error('No source stream defined'));
+  }
 };
 p.handleCopyFromChunk = function (chunk) {
   if ( this.stream ) this.stream.handleChunk(chunk);    
-  else this.handleError(new Error('error', 'No source stream defined'));
+  else {
+    // TODO: signal the problem somehow
+    //this.handleError(new Error('error', 'No destination stream defined'));
+  }
 }
 module.exports = Query;