hawkBit repository uses Optional on single entity find/get requests (#435)

* Repo returns optionals.
* Improved exception handling for collection usage in repo queries.

Signed-off-by: kaizimmerm <kai.zimmermann@bosch-si.com>

extensions/hawkbit-extension-uaa/pom.xml

@@ -59,4 +59,5 @@
          <scope>test</scope>
       </dependency>
    </dependencies>
+   <name>hawkBit :: Extensions :: UAA Integration</name>
 </project>