Don't have Fn.getEmails crash on null value

Caused by: [Error: Fn.getEmails(Context["document.routing.task.actors"]): null]
[Near : {... Unknown ....}]
             ^
[Line: 1, Column: 0]
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:388)
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:135)
	at org.mvel2.optimizers.dynamic.DynamicOptimizer.optimizeAccessor(DynamicOptimizer.java:66)
	at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:139)
	at org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:42)
	at org.mvel2.MVEL.executeExpression(MVEL.java:1057)
	at org.nuxeo.ecm.automation.core.scripting.MvelExpression.eval(MvelExpression.java:38)
	at org.nuxeo.ecm.automation.core.impl.OperationTypeImpl.inject(OperationTypeImpl.java:164)
	at org.nuxeo.ecm.automation.core.impl.OperationTypeImpl.newInstance(OperationTypeImpl.java:155)
	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.doInvoke(InvokableMethod.java:114)
	at org.nuxeo.ecm.automation.core.impl.InvokableIteratorMethod.doInvoke(InvokableIteratorMethod.java:111)
	at org.nuxeo.ecm.automation.core.impl.InvokableMethod.invoke(InvokableMethod.java:132)
	... 142 more
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:987)
	at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:326)
	... 153 more
Caused by: java.lang.NullPointerException
	at org.nuxeo.ecm.automation.features.PlatformFunctions.getEmails(PlatformFunctions.java:139)
	at org.nuxeo.ecm.automation.features.PlatformFunctions.getEmails(PlatformFunctions.java:123)
	... 159 more