fix contains key

Author: Baunsgaard

src/main/java/org/apache/sysds/runtime/frame/data/columns/HashMapToInt.java

@@ -93,7 +93,7 @@ public boolean isEmpty() {
 	@Override
 	@SuppressWarnings({"unchecked"})
 	public boolean containsKey(Object key) {
-		return get((K) key) != -1;
+		return getI((K) key) != -1;
 	}
 
 	@Override

src/test/java/org/apache/sysds/test/functions/transform/TransformApplyUnknownsTest.java

@@ -68,6 +68,7 @@ public void testTransformApplyRecode() {
 				Assert.assertTrue(Double.isNaN(out.get(i-1, 0)));
 		} 
 		catch (DMLRuntimeException e) {
+			e.printStackTrace();
 			throw new RuntimeException(e);
 		}
 	}

src/test/java/org/apache/sysds/test/functions/transform/TransformCSVFrameEncodeReadTest.java

@@ -21,9 +21,6 @@
 
 import static org.junit.Assert.fail;
 
-import java.io.File;
-import java.util.Scanner;
-
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.sysds.api.DMLScript;