Fix file.managed traceback when source is a list

If file.managed state has a source param which is a list, and none of
the URIs in that list are found, a traceback occurs. This commit
modifies salt.modules.file.source_list to raise an exception when source
is a list and no matches are found, and then catches that exception in
the file.managed state so that Salt can return gracefully with a False
result and meaningful error message.

salt/modules/file.py

@@ -1967,6 +1967,7 @@ def source_list(source, source_hash, saltenv):
                 mdirs += ['{0}?saltenv={1}'.format(d, senv)
                           for d in __salt__['cp.list_master_dirs'](senv)]
 
+        ret = None
         for single in source:
             if isinstance(single, dict):
                 # check the proto, if it is http or ftp then download the file
@@ -1985,14 +1986,21 @@ def source_list(source, source_hash, saltenv):
                     fn_ = __salt__['cp.get_url'](single_src, dest)
                     os.remove(fn_)
                     if fn_:
-                        source = single_src
-                        source_hash = single_hash
+                        ret = (single_src, single_hash)
                         break
             elif isinstance(single, salt._compat.string_types):
                 if single[7:] in mfiles or single[7:] in mdirs:
-                    source = single
+                    ret = (single, source_hash)
                     break
-    return source, source_hash
+        if ret is None:
+            # None of the list items matched
+            raise CommandExecutionError(
+                'none of the specified sources were found'
+            )
+        else:
+            return ret
+    else:
+        return source, source_hash
 
 
 def get_managed(
@@ -2016,8 +2024,7 @@ def get_managed(
 
         salt '*' file.get_managed /etc/httpd/conf.d/httpd.conf jinja salt://http/httpd.conf '{hash_type: 'md5', 'hsum': <md5sum>}' root root '755' base None None
     '''
-    # If the file is a template and the contents is managed
-    # then make sure to copy it down and templatize  things.
+    # Copy the file to the minion and templatize it
     sfn = ''
     source_sum = {}
     if template and source:

salt/states/file.py

@@ -1186,31 +1186,36 @@ def managed(name,
             context = {}
         context['accumulator'] = _ACCUMULATORS[name]
 
-    if __opts__['test']:
-        ret['result'], ret['comment'] = __salt__['file.check_managed'](
-            name,
+    try:
+        if __opts__['test']:
+            ret['result'], ret['comment'] = __salt__['file.check_managed'](
+                name,
+                source,
+                source_hash,
+                user,
+                group,
+                mode,
+                template,
+                makedirs,
+                context,
+                defaults,
+                __env__,
+                contents,
+                **kwargs
+            )
+            return ret
+
+        # If the source is a list then find which file exists
+        source, source_hash = __salt__['file.source_list'](
             source,
             source_hash,
-            user,
-            group,
-            mode,
-            template,
-            makedirs,
-            context,
-            defaults,
-            __env__,
-            contents,
-            **kwargs
+            __env__
         )
+    except CommandExecutionError as exc:
+        ret['result'] = False
+        ret['comment'] = 'Unable to manage file: {0}'.format(exc)
         return ret
 
-    # If the source is a list then find which file exists
-    source, source_hash = __salt__['file.source_list'](
-        source,
-        source_hash,
-        __env__
-    )
-
     # Gather the source file from the server
     try:
         sfn, source_sum, comment_ = __salt__['file.get_managed'](