Avoid soft crash if unknown device in verification

Rageshakes from the wild indicate that device was null here which
implies that we somehow did not know about the device when verifiying
it? Log and null-check to avoid a soft crash.

src/components/views/right_panel/EncryptionPanel.js

@@ -45,9 +45,6 @@ const EncryptionPanel = (props) => {
         }
     }, [verificationRequest]);
 
-    const deviceId = request && request.channel.deviceId;
-    const device = MatrixClientPeg.get().getStoredDevice(MatrixClientPeg.get().getUserId(), deviceId);
-
     useEffect(() => {
         async function awaitPromise() {
             setRequesting(true);
@@ -143,7 +140,7 @@ const EncryptionPanel = (props) => {
                 key={request.channel.transactionId}
                 inDialog={layout === "dialog"}
                 phase={phase}
-                device={device} />
+            />
         </React.Fragment>);
     }
 };