Fixed issue #584 (#586)

Fixed a Nullpointer exception in one.microstream.collections.lazy.LazySegmentUnloader.remove in case of no loaded segments.

(cherry picked from commit f036cb5)

Author: hg-ms

base/src/main/java/one/microstream/collections/lazy/LazySegmentUnloader.java

@@ -210,7 +210,10 @@ public LazySegmentUnloader copy()
 		@Override
 		public void remove(final LazySegment<?> segment)
 		{
-			this.loadedSegments.remove(segment);
+			if(this.loadedSegments != null)
+			{
+				this.loadedSegments.remove(segment);
+			}
 		}
 
 	}
@@ -313,7 +316,10 @@ public LazySegmentUnloader copy()
 		@Override
 		public void remove(final LazySegment<?> segment)
 		{
-			this.loadedSegments.remove(segment);
+			if(this.loadedSegments != null)
+			{
+				this.loadedSegments.remove(segment);
+			}
 		}
 
 	}