tests and fixes in week work

src/commonMain/kotlin/dev/inmo/krontab/internal/CronDateTime.kt

@@ -54,7 +54,7 @@ internal fun CronDateTime.toNearDateTime(relativelyTo: DateTime = DateTime.now()
             current = (current + diff.days).startOfDay
 
             val next = toNearDateTime(current)
-            if (next ?.dayOfWeek ?.index0 == weekDay) {
+            if (next == null || next.dayOfWeek.index0 == weekDay) {
                 return next
             }
         } while (true)

src/commonMain/kotlin/dev/inmo/krontab/internal/CronDateTimeScheduler.kt

@@ -27,8 +27,8 @@ internal data class CronDateTimeScheduler internal constructor(
      *
      * @see toNearDateTime
      */
-    override suspend fun next(relatively: DateTime): DateTime {
-        return cronDateTimes.mapNotNull { it.toNearDateTime(relatively) }.minOrNull() ?: getAnyNext(relatively)
+    override suspend fun next(relatively: DateTime): DateTime? {
+        return cronDateTimes.mapNotNull { it.toNearDateTime(relatively) }.minOrNull()
     }
 }