Prevent ephemeral messages caused by failed ask to propagate.

A failed ask predicate constitutes normal evaluation flow, no need to report
this to the user.

reactor/Core/src/jetbrains/mps/logic/reactor/core/CompositeFeedback.kt

@@ -107,6 +107,16 @@ class CompositeFeedback private constructor(private val elements: List<Feedback>
                 ?: ((right as? CompositeFeedback)?.composeLeft(left) ?: CompositeFeedback(Arrays.asList(left, right)))
         }
 
+        fun dropLast(mayberComposite: Feedback?): Feedback? =
+            if (mayberComposite == null || mayberComposite !is CompositeFeedback) {
+                null
+            } else if (mayberComposite.elements.size > 2) {
+                CompositeFeedback(mayberComposite.elements.dropLast(1))
+            } else if (mayberComposite.elements.size == 2) {
+                mayberComposite.elements[0]
+            } else throw NoSuchElementException()
+
+
         private fun maxSeverity(efs: List<Feedback>): EvaluationFeedback.Severity {
             var sev: EvaluationFeedback.Severity = EvaluationFeedback.Severity.DEBUG
             for (ef in efs) {

reactor/Core/src/jetbrains/mps/logic/reactor/core/internal/FeedbackStatus.kt

@@ -62,7 +62,7 @@ abstract class FeedbackStatus(val feedback : Feedback?) {
 
     class ABORTED(status: FeedbackStatus, val reason: Feedback) : FeedbackStatus(compose(status.feedback, reason)) {
         override val operational = false
-        override fun recover(): FeedbackStatus = NORMAL(feedback)
+        override fun recover(): FeedbackStatus = NORMAL(CompositeFeedback.dropLast(feedback))
     }
 }