spaces in file names can cause problems with RO Bundle generation

[mr-c]

cwl-docker-spring-1  | java.net.URISyntaxException: Illegal character in path at index 77: https://w3id.org/cwl/view/git/9b824c91cebb726f8e7d87c5f1f5760333fed9be/Screen Shot 2017-05-08 at 11.50.23 AM.png?format=raw
cwl-docker-spring-1  | 	at java.base/java.net.URI$Parser.fail(URI.java:2974)
cwl-docker-spring-1  | 	at java.base/java.net.URI$Parser.checkChars(URI.java:3145)
cwl-docker-spring-1  | 	at java.base/java.net.URI$Parser.parseHierarchical(URI.java:3227)
cwl-docker-spring-1  | 	at java.base/java.net.URI$Parser.parse(URI.java:3175)
cwl-docker-spring-1  | 	at java.base/java.net.URI.<init>(URI.java:623)
cwl-docker-spring-1  | 	at org.commonwl.view.researchobject.ROBundleService.addFilesToBundle(ROBundleService.java:312)
cwl-docker-spring-1  | 	at org.commonwl.view.researchobject.ROBundleService.createBundle(ROBundleService.java:161)
cwl-docker-spring-1  | 	at org.commonwl.view.researchobject.ROBundleFactory.createWorkflowRO(ROBundleFactory.java:77)