Fixes several NPE exceptions. Fix when there is no device specified for desktop share use desktop media use case when choosing video device.

src/net/java/sip/communicator/impl/neomedia/MediaServiceImpl.java

@@ -1318,7 +1318,8 @@ public boolean isPartialStreaming(MediaDevice mediaDevice)
         MediaDeviceImpl dev = (MediaDeviceImpl)mediaDevice;
         CaptureDeviceInfo devInfo = dev.getCaptureDeviceInfo();
 
-        return devInfo.getName().startsWith("Partial desktop streaming");
+        return (devInfo != null
+                && devInfo.getName().startsWith("Partial desktop streaming"));
     }
 
     /**

src/net/java/sip/communicator/impl/protocol/jabber/CallPeerJabberImpl.java

@@ -880,7 +880,9 @@ public void sendModifyVideoResolutionContent()
             return;
         }
 
-        content.setSenders(senders);
+        // if we are only receiving video senders is null
+        if(senders != null)
+            content.setSenders(senders);
 
         JingleIQ contentIQ = JinglePacketFactory
             .createContentModify(getProtocolProvider().getOurJID(),

src/net/java/sip/communicator/impl/protocol/jabber/OperationSetDesktopStreamingJabberImpl.java

@@ -194,10 +194,14 @@ public void setLocalVideoAllowed(Call call,
         CallJabberImpl callJabberImpl = (CallJabberImpl) call;
 
         if (mediaDevice == null)
-            mediaDevice = callJabberImpl.getDefaultDevice(MediaType.VIDEO);
+        {
+            MediaService mediaService = ProtocolMediaActivator.getMediaService();
+            mediaDevice = mediaService.getDefaultDevice(MediaType.VIDEO,
+                getMediaUseCase());
+        }
 
-        callJabberImpl.setLocalVideoAllowed(allowed, MediaUseCase.DESKTOP);
         callJabberImpl.setVideoDevice(mediaDevice);
+        callJabberImpl.setLocalVideoAllowed(allowed, getMediaUseCase());
 
         MediaFormat mediaDeviceFormat = mediaDevice.getFormat();