Exception in cuebot if service icon is not present

[lithorus]

Describe the bug If a layer is running using a custom service that does not have an icon on the cuebot server, it gets en exception that it's not able to read the image.

To Reproduce Steps to reproduce the behavior:

1. Submit job with eg. the blender service
2. Wait for job to complete
3. See error in cuebot log

Expected behavior Icons for custom services should be optional and not required. It should not bring an exception

Error Log

2024-07-22 21:43:15,990 ERROR pool-3-thread-1 com.imageworks.spcue.service.EmailSupport - Unable to read services/blender.png
java.io.IOException: Unable to load
	at com.imageworks.spcue.service.EmailSupport.loadImage(EmailSupport.java:101) [main/:?]
	at com.imageworks.spcue.service.EmailSupport.sendShutdownEmail(EmailSupport.java:263) [main/:?]
	at com.imageworks.spcue.service.JobManagerSupport.shutdownJob(JobManagerSupport.java:160) [main/:?]
	at com.imageworks.spcue.dispatcher.commands.DispatchJobComplete$1.wrapDispatchCommand(DispatchJobComplete.java:49) [main/:?]
	at com.imageworks.spcue.dispatcher.commands.DispatchCommandTemplate.execute(DispatchCommandTemplate.java:36) [main/:?]
	at com.imageworks.spcue.dispatcher.commands.DispatchJobComplete.run(DispatchJobComplete.java:51) [main/:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
	at java.lang.Thread.run(Thread.java:830) [?:?]

Version Number 688425ce859f183126ab8235543e4b0a13ff6c50

Additional context Seems related to the new email template when jobs are finished.