Added IsEmptyLines.

internal/dispatcher/dispatcher.go

@@ -292,7 +292,7 @@ func handleExecuteRequest(msg kernel.Message, goExec *goexec.State) error {
 		if err := specialcmd.Parse(msg, goExec, true, lines, specialLines); err != nil {
 			executionErr = errors.WithMessagef(err, "executing special commands in cell")
 		}
-		hasMoreToRun := len(specialLines) < len(lines) || goExec.CellIsTest
+		hasMoreToRun := !goexec.IsEmptyLines(lines, specialLines) || goExec.CellIsTest
 		if executionErr == nil && !msg.Kernel().Interrupted.Load() && hasMoreToRun {
 			executionErr = goExec.ExecuteCell(msg, msg.Kernel().ExecCounter, lines, specialLines)
 		}

internal/goexec/parser.go

@@ -9,6 +9,7 @@ import (
 	"io/fs"
 	"math/rand"
 	"os"
+	"regexp"
 	"strconv"
 	"strings"
 
@@ -554,3 +555,22 @@ func (s *State) DefaultCellTestArgs() (args []string) {
 	klog.V(2).Infof("DefaultCellTestArgs: %v", args)
 	return
 }
+
+var regexpAllSpaces = regexp.MustCompile(`^\s*$`)
+
+// IsEmptyLines returns true is all lines are marked to skip, or if all lines not marked as skip are empty.
+func IsEmptyLines(lines []string, skipLines Set[int]) bool {
+	if len(skipLines) >= len(lines) {
+		return true
+	}
+	for ii, line := range lines {
+		if skipLines.Has(ii) {
+			continue
+		}
+		if len(line) == 0 || regexpAllSpaces.MatchString(line) {
+			continue
+		}
+		return false
+	}
+	return true
+}