added source maps = false to ng test according to https://stackoverflow.com/questions/45722256/how-do-i-debug-a-object-errorevent-thrown-error-in-my-karma-jasmine-tests

Author: janniclas

.travis.yml

@@ -12,7 +12,7 @@ apt:
 before_install:
   -  npm install -g @angular/cli
 script:
-  - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then sbt ++$TRAVIS_SCALA_VERSION test; cd client && npm install && ng build --prod && npm run test -- --no-progress --browsers=ChromeHeadlessCI && cd .. ; fi'
-  - 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then sbt ++$TRAVIS_SCALA_VERSION coverage test coverageReport coverageAggregate codacyCoverage; cd client && npm install && ng build --prod && npm run test -- --no-progress --browsers=ChromeHeadlessCI && cd .. ; fi'
+  - 'if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then sbt ++$TRAVIS_SCALA_VERSION test; cd client && npm install && ng build --prod && npm run test -- --no-progress --browsers=ChromeHeadlessCI --source-map=false && cd .. ; fi'
+  - 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then sbt ++$TRAVIS_SCALA_VERSION coverage test coverageReport coverageAggregate codacyCoverage; cd client && npm install && ng build --prod && npm run test -- --no-progress --browsers=ChromeHeadlessCI --source-map=false && cd .. ; fi'
 after_success:
   - 'if [ "$TRAVIS_PULL_REQUEST" = "false" ]; then bash <(curl -s https://codecov.io/bash); fi'