[UD] Use default icon if actual icon is not accessible

[akurinnoy]

What does this PR do?

If User Dashboard cannot access or retrieve a devfile icon then default icon will be shown.

This is cherry-pick of 837ce36

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has failed:

• Build details
• Test report
• docker image: eclipseche/che-server:15195
  https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.
  Use command "ci-test" to rerun the test.

[che-bot]

❌ E2E Happy path tests failed ❗

See Details

• Jenkins job

• test report

• logs and configs

• Happy path tests DevFile

• image: maxura/che-server:15195

Tested with Eclipse Che Single User on K8S (minikube v1.1.1)

⚠️ https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.

ℹ️ Use comment "crw-ci-test" to rerun happy path E2E test.

[che-bot]

❌ E2E Happy path tests failed ❗

See Details

• Jenkins job

• test report

• logs and configs

• Happy path tests DevFile

• image: maxura/che-server:15195

Tested with Eclipse Che Single User on K8S (minikube v1.1.1)

⚠️ https://github.com/orgs/eclipse/teams/eclipse-che-qa please check this report.

ℹ️ Use comment "crw-ci-test" to rerun happy path E2E test.

[che-bot]

E2E tests of Eclipse Che Multiuser on OCP has been successful:

• Build details
• Test report
• docker image: eclipseche/che-server:15195