json: Improve error handling and adding ability to limit log output.

recipe_modules/json/example.expected/basic.json

Index: recipe_modules/json/example.expected/basic.json
diff --git a/recipe_modules/json/example.expected/basic.json b/recipe_modules/json/example.expected/basic.json
index 613adfac52c2641f99182bb20499182392c7cbaa..f62ad30d3f6446c326a9eef245ee569bb6aa0951 100644
--- a/recipe_modules/json/example.expected/basic.json
+++ b/recipe_modules/json/example.expected/basic.json
@@ -128,11 +128,41 @@
     ],
     "name": "invalid json",
     "~followup_annotations": [
-      "@@@STEP_LOG_LINE@json.output (invalid)@{\"here is some total@@@",
-      "@@@STEP_LOG_LINE@json.output (invalid)@garbage@@@",
-      "@@@STEP_LOG_END@json.output (invalid)@@@",
+      "@@@STEP_LOG_LINE@json.output (exception)@input was invalid@@@",
       "@@@STEP_LOG_LINE@json.output (exception)@Invalid control character at: line 1 column 21 (char 20)@@@",
-      "@@@STEP_LOG_END@json.output (exception)@@@"
+      "@@@STEP_LOG_END@json.output (exception)@@@",
+      "@@@STEP_LOG_LINE@json.output@{\"here is some total@@@",
+      "@@@STEP_LOG_LINE@json.output@garbage@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "RECIPE[recipe_engine::json:example].resources/cool_script.py",
+      "",
+      "/path/to/tmp/json"
+    ],
+    "name": "empty json",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output (exception)@input was empty@@@",
+      "@@@STEP_LOG_LINE@json.output (exception)@No JSON object could be decoded@@@",
+      "@@@STEP_LOG_END@json.output (exception)@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "RECIPE[recipe_engine::json:example].resources/cool_script.py",
+      "/path/to/tmp/json"
+    ],
+    "name": "None json",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output (exception)@input was empty@@@",
+      "@@@STEP_LOG_LINE@json.output (exception)@No JSON object could be decoded@@@",
+      "@@@STEP_LOG_END@json.output (exception)@@@",
+      "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {