Merge pull request #735 from FgForrest/734-when-prices-are-completely…

…-reset-on-an-existing-entity-removal-mutation-for-already-dropped-price-might-be-generated

fix(#734): When prices are completely reset on an existing entity, removal mutation for already dropped price might be generated

evita_api/src/main/java/io/evitadb/api/requestResponse/data/structure/ExistingPricesBuilder.java

@@ -335,6 +335,7 @@ public int version() {
 							}),
 						originalPrices
 							.stream()
+							.filter(Droppable::exists)
 							.filter(it -> priceMutations.get(it.priceKey()) == null)
 							.map(it -> new RemovePriceMutation(it.priceKey()))
 					)