Error when component name not present in zip components or installed components

Error

To reproduce add content with a new component that is not included in the import zip.

(node:3626) UnhandledPromiseRejectionWarning: TypeError: Cannot read property '_id' of undefined
    at Promise (/source/deltanet/github/adapt_authoring/plugins/output/adapt/importsource.js:501:70)
    at new Promise (<anonymous>)
    at transformContent (/source/deltanet/github/adapt_authoring/plugins/output/adapt/importsource.js:488:12)
    at transform (/source/deltanet/github/adapt_authoring/plugins/output/adapt/importsource.js:561:9)
    at /source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:3880:24
    at replenish (/source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:1011:17)
    at /source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:1016:9
    at eachOfLimit (/source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:1041:24)
    at /source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:1046:16
    at _parallel (/source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:3879:5)
    at Object.series (/source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:4735:5)
    at createContentItem (/source/deltanet/github/adapt_authoring/plugins/output/adapt/importsource.js:559:11)
    at /source/deltanet/github/adapt_authoring/plugins/output/adapt/importsource.js:432:13
    at /source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:3110:16
    at replenish (/source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:1011:17)
    at iterateeCallback (/source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:995:17)
    at /source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:969:16
    at /source/deltanet/github/adapt_authoring/plugins/output/adapt/importsource.js:441:15
    at error (/source/deltanet/github/adapt_authoring/plugins/output/adapt/importsource.js:615:53)
    at /source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:473:16
    at iteratorCallback (/source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:1064:13)
    at /source/deltanet/github/adapt_authoring/node_modules/async/dist/async.js:969:16
    at /source/deltanet/github/adapt_authoring/plugins/output/adapt/importsource.js:685:15
    at /source/deltanet/github/adapt_authoring/lib/dml/mongoose/index.js:266:14
    at /source/deltanet/github/adapt_authoring/node_modules/mongoose/lib/model.js:4698:16
    at /source/deltanet/github/adapt_authoring/node_modules/mongoose/lib/utils.js:258:16
    at model.$__save.error (/source/deltanet/github/adapt_authoring/node_modules/mongoose/lib/model.js:479:7)
    at /source/deltanet/github/adapt_authoring/node_modules/mongoose/node_modules/kareem/index.js:315:21
(node:3626) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:3626) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Imports should always have a corresponding plugin for each components referenced in JSON, so not really an issue, just wanted to records some where.