tuna-script: validate tuning file for the presence of data (#1929)

Author: dorde-antic

mlir/utils/tuna/tuna-script.sh

@@ -59,13 +59,12 @@ validate_tuning_file() {
         echo "ERROR: $f has duplicate header lines next to each other!"
         exit 1
     fi
-    # NOTE: Temporarily disabled the check for data lines after the header.
-    # Existing checks
-    #data_line=$(awk 'NR>1 && $0 !~ /^\s*$/ && $0 != header {print; exit}' header="$header" "$f")
-    #if [ -z "$data_line" ]; then
-    #    echo "ERROR: $f has no data after header!"
-    #    exit 1
-    #fi
+    # Check for the presence of data after header
+    data_line=$(awk 'NR>1 && $0 !~ /^\s*$/ && $0 != header {print; exit}' header="$header" "$f")
+    if [ -z "$data_line" ]; then
+        echo "ERROR: $f has no data after header!"
+        exit 1
+    fi
 }
 
 function tuna_run