fix(deployment): only render deployment button if deployment is deplo…

…yed to server

lib/manager/components/DeploymentPreviewButton.js

@@ -8,9 +8,16 @@ export default class DeploymentPreviewButton extends Component {
   }
   render () {
     const { deployment } = this.props
-    const { id, projectBounds } = deployment
-    // TODO: add Try it button
-    const server = deployment.project.otpServers.find(server => server.name === deployment.deployedTo)
+    const { id, deployedTo, project, projectBounds } = deployment
+    if (!deployedTo) {
+      // Deployment has not been deployed to a server, do not render button.
+      return null
+    }
+    if (!deployment.project.otpServers) {
+      console.warn(`No otp servers defined for project`)
+      return null
+    }
+    const server = project.otpServers.find(server => server.name === deployedTo)
     let href = server && server.publicUrl
     if (!href || href.length === 0) {
       console.warn(`No public URL set for deployment id=${id}`)