NPE on starting process if no query is set to dialog parameter of entity type

[knstvk]

Create a start event with input dialog using BPMN designer in Studio. Add an entity parameter and leave JPQL Query parameter empty as suggested in Getting Started with BPM tutorial.

You will get NPE on process start:

java.lang.NullPointerException: null
	at java.base/java.util.Objects.requireNonNull(Objects.java:221) ~[na:na]
	at java.base/java.util.stream.Collectors.lambda$uniqKeysMapAccumulator$1(Collectors.java:178) ~[na:na]
	at java.base/java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169) ~[na:na]
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[na:na]
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913) ~[na:na]
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578) ~[na:na]
	at io.jmix.bpm.data.form.FormField.getPropertiesMap(FormField.java:84) ~[jmix-bpm-1.3.1.jar:na]
	at io.jmix.bpmui.screen.dynamicform.DynamicFormFieldComponentsFactoryBean.createEntityField(DynamicFormFieldComponentsFactoryBean.java:182) ~[jmix-bpm-ui-1.3.1.jar:na]
	at io.jmix.bpmui.screen.dynamicform.DynamicFormFieldComponentsFactoryBean.createComponent(DynamicFormFieldComponentsFactoryBean.java:99) ~[jmix-bpm-ui-1.3.1.jar:na]
	at io.jmix.bpmui.screen.dynamicform.DynamicProcessForm.initForm(DynamicProcessForm.java:29) ~[jmix-bpm-ui-1.3.1.jar:na]
	at io.jmix.bpmui.screen.dynamicform.DynamicStartProcessForm.setProcessDefinition(DynamicStartProcessForm.java:45) ~[jmix-bpm-ui-1.3.1.jar:na]
	at io.jmix.bpmui.processform.screencreator.impl.InputDialogProcessFormScreenCreator.createStartProcessScreen(InputDialogProcessFormScreenCreator.java:40) ~[jmix-bpm-ui-1.3.1.jar:na]
	at io.jmix.bpmui.processform.ProcessFormScreensImpl.createStartProcessForm(ProcessFormScreensImpl.java:44) ~[jmix-bpm-ui-1.3.1.jar:na]
	at io.jmix.bpmui.screen.startprocess.StartProcessScreen.onProcessDefinitionsTableStartProcess(StartProcessScreen.java:95) ~[jmix-bpm-ui-1.3.1.jar:na]