When a project does not contain any version the Requirement issue page gives a loading error

An error is shown to the user whenever he browses a Requirement Issue page. This only happens when the project does not contain versions.

java.lang.NullPointerException
[INFO] [talledLocalContainer] at com.xpandit.raven.customfield.RequirementStatusCustomField.getRequirementStatusCount(RequirementStatusCustomField.java:283)
[INFO] [talledLocalContainer] at com.xpandit.raven.customfield.RequirementStatusCustomField.getValueFromIssue(RequirementStatusCustomField.java:243)
[INFO] [talledLocalContainer] at com.xpandit.raven.customfield.RequirementStatusCustomField.getValueFromIssue(RequirementStatusCustomField.java:44)
[INFO] [talledLocalContainer] at com.atlassian.jira.issue.fields.CustomFieldImpl.getCustomFieldParamsFromIssue(CustomFieldImpl.java:1454)
[INFO] [talledLocalContainer] at com.atlassian.jira.issue.fields.CustomFieldImpl.populateFromIssue(CustomFieldImpl.java:681)
[INFO] [talledLocalContainer] at com.atlassian.jira.issue.fields.screen.FieldScreenRenderLayoutItemImpl.populateFromIssue(FieldScreenRenderLayoutItemImpl.java:103)
[INFO] [talledLocalContainer] at com.atlassian.jira.issue.fields.rest.FieldHtmlFactoryImpl.getEditFields(FieldHtmlFactoryImpl.java:135)
[INFO] [talledLocalContainer] at sun.reflect.GeneratedMethodAccessor821.invoke(Unknown Source)
[INFO] [talledLocalContainer] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[INFO] [talledLocalContainer] at java.lang.reflect.Method.invoke(Method.java:597)