Fixed problem where Chrome thought it already has an offer because the SDP is empty string instead of returning null for remoteOffer.

static/js/mediastream/peerconnection.js

@@ -268,6 +268,16 @@ define(['jquery', 'underscore', 'webrtc.adapter'], function($, _) {
 
 	};
 
+	PeerConnection.prototype.hasRemoteDescription = function() {
+
+		// NOTE(longsleep): Chrome seems to return empty sdp even if no remoteDescription was set.
+		if (!this.pc || !this.pc.remoteDescription || !this.pc.remoteDescription.sdp) {
+			return false
+		}
+		return true;
+
+	};
+
 	PeerConnection.prototype.setRemoteDescription = function() {
 
 		return this.pc.setRemoteDescription.apply(this.pc, arguments);

static/js/mediastream/webrtc.js

@@ -237,7 +237,7 @@ function($, _, PeerCall, PeerConference, PeerXfer, PeerScreenshare, UserMedia, u
 				console.log("Offer process.");
 				targetcall = this.findTargetCall(from);
 				if (targetcall) {
-					if (!this.settings.renegotiation && targetcall.peerconnection && targetcall.peerconnection.pc && targetcall.peerconnection.pc.remoteDescription) {
+					if (!this.settings.renegotiation && targetcall.peerconnection && targetcall.peerconnection.hasRemoteDescription()) {
 						// Call replace support without renegotiation.
 						this.doHangup("unsupported", from);
 						console.error("Processing new offers is not implemented without renegotiation.");