Excuse no wait for a move from a build not known, and count a module put back only once there is one (hq issue 318 review)

cmd/mesh-controller/gate.go

@@ -632,9 +632,14 @@ func movesAddingGroups(ctx context.Context, inv *inventory.Inventory, g *invento
 		if err != nil || !found {
 			target = shelf[j.module]
 		}
+		// What it moved from is not known — no build named (a plan's own module whose previous build was not
+		// recorded), or no manifest kept for it: no wait is excused, rather than one the move did not bring.
+		if from == "" {
+			out[j.module] = false
+			continue
+		}
 		before, had, err := inv.ManifestAt(ctx, j.module, from)
-		if err != nil || (from != "" && !had) {
-			// What it moved from is not known: no wait is excused, rather than one the move did not bring.
+		if err != nil || !had {
 			out[j.module] = false
 			continue
 		}