Add test for crash in "bundle summary" (#3138)

Bug introduced in #3123

Author: denik

acceptance/bundle/summary/missing-libraries-file-path/databricks.yml

@@ -0,0 +1,7 @@
+resources:
+  pipelines:
+    my_pipeline:
+      name: test-pipeline
+      libraries:
+        - file:
+            path: "./intentionally-missing.py"

acceptance/bundle/summary/missing-libraries-file-path/output.txt

@@ -0,0 +1,22 @@
+
+=== Initial view of resources without id and modified_status=created
+>>> [CLI] bundle summary -o json
+Error: file intentionally-missing.py not found
+Please report this issue to Databricks in the form of a GitHub issue at:
+https://github.com/databricks/cli
+
+Panic Payload: runtime error: invalid memory address or nil pointer dereference
+goroutine 1 [running]:
+runtime/debug.Stack()
+github.com/databricks/cli/cmd/root.Execute.func1()
+panic({HEX?, HEX?})
+github.com/databricks/cli/cmd/bundle.renderJsonOutput(HEX, HEX?)
+github.com/databricks/cli/cmd/bundle.renderBundle(HEX, HEX, {HEX, HEX, HEX}, HEX)
+github.com/databricks/cli/cmd/bundle.newSummaryCommand.func1(HEX, {HEX?, HEX?, HEX?})
+github.com/spf13/cobra.(*Command).execute(HEX, {HEX, HEX, HEX})
+github.com/spf13/cobra.(*Command).ExecuteC(HEX)
+github.com/spf13/cobra.(*Command).ExecuteContextC(...)
+github.com/databricks/cli/cmd/root.Execute({HEX, HEX}, HEX)
+main.main()
+
+Exit code: 1

acceptance/bundle/summary/missing-libraries-file-path/script

@@ -0,0 +1,2 @@
+title "Initial view of resources without id and modified_status=created"
+trace $CLI bundle summary -o json

acceptance/bundle/summary/missing-libraries-file-path/test.toml

@@ -0,0 +1,9 @@
+Badness = "Unexpected panic"
+
+[[Repls]]
+Old = '0x[0-9a-f]{1,}'
+New = 'HEX'
+
+[[Repls]]
+Old = '\n\s+.*\n'
+New = "\n"