Simplify autoconf method

It's quite bogus, since any exceptions will be thrown during
initialization.

plugins/network/nft_counters

@@ -262,21 +262,24 @@ class MuninNftCountersPlugin(MuninPlugin):
 
 
     def autoconf(self):
+        """
+        Implements Munin Plugin Auto-Configuration Option.
+
+        Returns
+        -------
+        bool
+            True if plugin can be auto-configured.
 
         """
 
-        Checks if nft command can be run (needs root) and if so,
+        # Any exceptions (e.g. insufficient permissions, missing dependencies)
-        if there any counters present in nftables
+        # will already throw an exception when the plugin is initialized since
-
+        # the plugin reads all its data from nftables. So below should always
-        """
+        # return True (print "yes").
-
         try:
             counters = getCounters()
-            if len(counters) > 0:
+            return True
-                return True
+        except ValueError:
-            else:
-                return False
-        except:
             return False