[file] fix glob_paths when NO paths match, add tests.

recipe_modules/file/examples/glob.expected/basic.json

Index: recipe_modules/file/examples/glob.expected/basic.json
diff --git a/recipe_modules/file/examples/glob.expected/basic.json b/recipe_modules/file/examples/glob.expected/basic.json
new file mode 100644
index 0000000000000000000000000000000000000000..c314875e5cdc2a1f3cdccca08b59ff886703f196
--- /dev/null
+++ b/recipe_modules/file/examples/glob.expected/basic.json
@@ -0,0 +1,121 @@
+[
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "data",
+      "[START_DIR]/thing.pat"
+    ],
+    "infra_step": true,
+    "name": "write thing.pat"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "data",
+      "[START_DIR]/other.pat"
+    ],
+    "infra_step": true,
+    "name": "write other.pat"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "data",
+      "[START_DIR]/something"
+    ],
+    "infra_step": true,
+    "name": "write something"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "data",
+      "[START_DIR]/file"
+    ],
+    "infra_step": true,
+    "name": "write file"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "glob",
+      "[START_DIR]",
+      "*.pat"
+    ],
+    "infra_step": true,
+    "name": "pat",
+    "stdout": "/path/to/tmp/",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@glob@[START_DIR]/other.pat@@@",
+      "@@@STEP_LOG_LINE@glob@[START_DIR]/thing.pat@@@",
+      "@@@STEP_LOG_END@glob@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "glob",
+      "[START_DIR]",
+      "*.nop"
+    ],
+    "infra_step": true,
+    "name": "noop",
+    "stdout": "/path/to/tmp/",
+    "~followup_annotations": [
+      "@@@STEP_LOG_END@glob@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "glob",
+      "[START_DIR]",
+      "*thing*"
+    ],
+    "infra_step": true,
+    "name": "thing",
+    "stdout": "/path/to/tmp/",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@glob@[START_DIR]/something@@@",
+      "@@@STEP_LOG_LINE@glob@[START_DIR]/thing.pat@@@",
+      "@@@STEP_LOG_END@glob@@@"
+    ]
+  },
+  {
+    "name": "$result",
+    "recipe_result": null,
+    "status_code": 0
+  }
+]