BUGFIX: stop on non-matching res level

Author: xulman

src/main/java/cz/it4i/fiji/legacy/ReadFullImage.java

@@ -160,6 +160,10 @@ Dataset readNow(final String url, final String datasetID,
 			rangeSpatialY();
 			rangeSpatialZ();
 
+			if (currentResLevel == null)
+				throw new IOException("Cannot read at res level "+resolutionLevelsAsStr
+						+" because the dataset is not having this one.");
+
 			return this.readWithAType();
 		}
 	}

src/main/java/cz/it4i/fiji/legacy/WriteFullImage.java

@@ -225,6 +225,10 @@ void writeNow(final Img<TR> img, final String url, final String datasetID,
 			rangeSpatialY();
 			rangeSpatialZ();
 
+			if (currentResLevel == null)
+				throw new IOException("Cannot write to res level "+resolutionLevelsAsStr
+						+" because the dataset is not having this one.");
+
 			this.writeWithAType(image);
 
 			if (uploadResPyramids)