fix LongLongHashMap.forEachOrdered for negative values

primitiveCollections/src/main/java/org/lucares/collections/LongLongHashMap.java

@@ -283,6 +283,9 @@ public class LongLongHashMap {
 				consumer.accept(key, get(key));
 			} else if (key == EMPTY_SLOT) {
 				final int posFirstKey = findPosOfFirstPositiveKey(sortedKeys);
+				if (posFirstKey < 0) {
+					return;
+				}
 				i = posFirstKey - 1;
 			}
 		}