Fix #1815 - skip pods with empty node names (#1844)

## Description

This resolves an issue where Zarf hangs on init when a pending pod (with
no node name) exists.

## Related Issue

Fixes #1815 

## Type of change

- [X] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [X] Test, docs, adr added or updated as needed
- [X] [Contributor Guide
Steps](https://github.com/defenseunicorns/zarf/blob/main/CONTRIBUTING.md#developer-workflow)
followed

src/pkg/k8s/images.go

@@ -54,16 +54,22 @@ func (k *K8s) GetImagesWithNodes(namespace string) (ImageNodeMap, error) {
 		return nil, fmt.Errorf("unable to get the list of pods in the cluster")
 	}
 
-	findImages:
+findImages:
 	for _, pod := range pods.Items {
 		nodeName := pod.Spec.NodeName
+
+		// If this pod doesn't have a node (i.e. is Pending), skip it
+		if nodeName == "" {
+			continue
+		}
+
 		nodeDetails, err := k.GetNode(nodeName)
 		if err != nil {
 			return nil, fmt.Errorf("unable to get the node %s", pod.Spec.NodeName)
 		}
 
 		for _, taint := range nodeDetails.Spec.Taints {
-			if (taint.Effect == corev1.TaintEffectNoSchedule || taint.Effect == corev1.TaintEffectNoExecute) {
+			if taint.Effect == corev1.TaintEffectNoSchedule || taint.Effect == corev1.TaintEffectNoExecute {
 				continue findImages
 			}
 		}

src/test/e2e/20_zarf_init_test.go

@@ -55,6 +55,12 @@ func TestZarfInit(t *testing.T) {
 	require.Error(t, err, stdErr)
 	require.Contains(t, stdErr, expectedErrorMessage)
 
+	if !e2e.ApplianceMode {
+		// throw a pending pod into the cluster to ensure we can properly ignore them when selecting images
+		_, _, err = e2e.Kubectl("apply", "-f", "https://raw.githubusercontent.com/kubernetes/website/main/content/en/examples/pods/pod-with-node-affinity.yaml")
+		require.NoError(t, err)
+	}
+
 	// run `zarf init`
 	_, initStdErr, err := e2e.Zarf("init", "--components="+initComponents, "--nodeport", "31337", "-l", "trace", "--confirm")
 	require.NoError(t, err)