Allow plugins to run that do not have platform config value (kevoreil…

…ly#2157)

* Allow plugins to run that do not have platform config value
Follow on from kevoreilly#2154, fix a bug where no results are returned if `options.plaform` exists but is `None`.

* Update comment for platform-specific plugin code

lib/cuckoo/core/plugins.py

@@ -232,11 +232,11 @@ def process(self, module):
         if not options.enabled:
             return None
 
-        # Check if the module is platform specific, such as strace, to prevent
-        # break processing.
+        # Check if the module is platform specific (e.g. strace) to prevent
+        # processing errors.
         platform = self.task.get("platform", "")
-        if hasattr(options, "platform") and options.platform != platform:
-            log.debug("Plugin not compatible with platform: %s", platform)
+        if getattr(options, "platform", None) and options.platform != platform:
+            log.debug("Plugin %s not compatible with platform: %s", module_name, platform)
             return None
 
         # Give it path to the analysis results.