Implement Error Handling

[jaschibler]

Task Description
Implement error notification and handling for cases in which application is unable to complete the requested task. Examples:
"No results found" when search returns no hits
"Cannot connect to server application"
"Invalid data received from server"
"Resource URL invalid"

Technical Considerations
Include any technical considerations including architecture (e.g. API), required libraries, etc.

Additional Considerations
Any supplemental information including unresolved questions, links to external resources, screenshots, etc.