Querying can fail if content has attachments

[anatol-sialitski]

Caused by: jdk.nashorn.internal.runtime.ECMAException: TypeError: null is not an Object at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ECMAErrors.error(ECMAErrors.java:57) at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:213) at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:185) at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ECMAErrors.typeError(ECMAErrors.java:172) at jdk.scripting.nashorn/jdk.nashorn.internal.objects.NativeObject.notAnObject(NativeObject.java:147) at jdk.scripting.nashorn/jdk.nashorn.internal.objects.NativeObject.keys(NativeObject.java:467) at jdk.scripting.nashorn.scripts/jdk.nashorn.internal.scripts.Script$Recompilation$7537$56AA$node_transformer.L:1#addRecursiveNodeId(com.enonic.app.market:/lib/guillotine/util/node-transformer.js:3) at jdk.scripting.nashorn.scripts/jdk.nashorn.internal.scripts.Script$Recompilation$7539$381A$nodetransformer.L:1#addRecursiveNodeId#\==_!3#\==\!7(com.enonic.app.market:/lib/guillotine/util/node-transformer.js:7) at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:657) at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:513) at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:527) at jdk.scripting.nashorn/jdk.nashorn.internal.objects.NativeArray$9.forEach(NativeArray.java:1577) at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.arrays.IteratorAction.apply(IteratorAction.java:110) at jdk.scripting.nashorn/jdk.nashorn.internal.objects.NativeArray.forEach(NativeArray.java:1580) at