not really a change

Author: Baunsgaard

src/main/java/org/apache/sysds/runtime/frame/data/FrameBlock.java

@@ -769,7 +769,7 @@ public void write(DataOutput out) throws IOException {
 				out.writeUTF(getColumnName(j));
 				_colmeta[j].write(out);
 			}
-			if(type >= 0 && nRow > 0) // if allocated write column data
+			if(type > 0 && nRow > 0) // if allocated write column data
 				_coldata[j].write(out);
 		}
 	}
@@ -910,7 +910,7 @@ public long getExactSerializedSize() {
 				size += IOUtilFunctions.getUTFSize(getColumnName(j));
 				size += _colmeta[j].getExactSerializedSize();
 			}
-			if(type >= 0)
+			if(type > 0)
 				size += _coldata[j].getExactSerializedSize();
 		}
 		return size;