Do not replace pipeline libraries if there are no matches for pattern (#1021)

## Changes
If there are no matches when doing Glob call for pipeline library
defined, leave the entry as is.
The next mutators in the chain will detect that file is missing and the
error will be more user friendly.


Before the change

```
Starting resource deployment
Error: terraform apply: exit status 1

Error: cannot create pipeline: libraries must contain at least one element
```

After

```
Error: notebook ./non-existent not found
```


## Tests
Added regression unit tests

bundle/config/mutator/expand_pipeline_glob_paths.go

@@ -38,6 +38,11 @@ func (m *expandPipelineGlobPaths) Apply(_ context.Context, b *bundle.Bundle) err
 				return err
 			}
 
+			if len(matches) == 0 {
+				expandedLibraries = append(expandedLibraries, *library)
+				continue
+			}
+
 			for _, match := range matches {
 				m, err := filepath.Rel(dir, match)
 				if err != nil {

bundle/config/mutator/expand_pipeline_glob_paths_test.go

@@ -85,6 +85,11 @@ func TestExpandGlobPathsInPipelines(t *testing.T) {
 										Path: "/Repos/somerepo/test.ipynb",
 									},
 								},
+								{
+									Notebook: &pipelines.NotebookLibrary{
+										Path: "./non-existent.ipynb",
+									},
+								},
 							},
 						},
 					},
@@ -98,7 +103,7 @@ func TestExpandGlobPathsInPipelines(t *testing.T) {
 	require.NoError(t, err)
 
 	libraries := b.Config.Resources.Pipelines["pipeline"].Libraries
-	require.Len(t, libraries, 10)
+	require.Len(t, libraries, 11)
 
 	// Making sure glob patterns are expanded correctly
 	require.True(t, containsNotebook(libraries, filepath.Join("test", "test2.ipynb")))
@@ -117,6 +122,7 @@ func TestExpandGlobPathsInPipelines(t *testing.T) {
 	// Making sure other libraries are not replaced
 	require.True(t, containsJar(libraries, "./*.jar"))
 	require.True(t, containsMaven(libraries, "org.jsoup:jsoup:1.7.2"))
+	require.True(t, containsNotebook(libraries, "./non-existent.ipynb"))
 }
 
 func containsNotebook(libraries []pipelines.PipelineLibrary, path string) bool {

bundle/tests/bundle/pipeline_glob_paths/databricks.yml

@@ -0,0 +1,12 @@
+bundle:
+  name: pipeline_glob_paths
+
+resources:
+  pipelines:
+    nyc_taxi_pipeline:
+      name: "nyc taxi loader"
+      libraries:
+        - notebook:
+            path: ./dlt/*
+        - notebook:
+            path: ./non-existent

bundle/tests/bundle/pipeline_glob_paths/dlt/nyc_taxi_loader.py

@@ -0,0 +1,3 @@
+# Databricks notebook source
+
+print("Hello from notebook!")

bundle/tests/bundle/pipeline_glob_paths_test.go

@@ -0,0 +1,40 @@
+package bundle
+
+import (
+	"context"
+	"testing"
+
+	"github.com/databricks/cli/bundle"
+	"github.com/databricks/cli/bundle/config"
+	"github.com/databricks/cli/bundle/config/mutator"
+	"github.com/databricks/cli/bundle/phases"
+	"github.com/databricks/cli/cmd/root"
+	"github.com/databricks/databricks-sdk-go/service/iam"
+	"github.com/stretchr/testify/require"
+)
+
+func TestExpandPipelineGlobPathsWithNonExistent(t *testing.T) {
+	ctx := context.Background()
+	ctx = root.SetWorkspaceClient(ctx, nil)
+
+	b, err := bundle.Load(ctx, "./pipeline_glob_paths")
+	require.NoError(t, err)
+
+	err = bundle.Apply(ctx, b, bundle.Seq(mutator.DefaultMutators()...))
+	require.NoError(t, err)
+	b.Config.Bundle.Target = "default"
+
+	b.Config.Workspace.CurrentUser = &config.User{User: &iam.User{UserName: "user@domain.com"}}
+	b.WorkspaceClient()
+
+	m := phases.Initialize()
+	err = bundle.Apply(ctx, b, m)
+	require.Error(t, err)
+	require.ErrorContains(t, err, "notebook ./non-existent not found")
+
+	require.Equal(
+		t,
+		b.Config.Resources.Pipelines["nyc_taxi_pipeline"].Libraries[0].Notebook.Path,
+		"/Users/user@domain.com/.bundle/pipeline_glob_paths/default/files/dlt/nyc_taxi_loader",
+	)
+}