Merge bitcoin#12568: Allow dustrelayfee to be set to zero

874e818 Allow dustrelayfee to be set to zero (Luke Dashjr)

Pull request description:

  I don't see and can't think of any rationale for forbidding this configuration.

Tree-SHA512: df09441f4aec63e79bea94838b7f8e336cebaeb0a22b5e58d27937bbeb1377f229921aeae43674e0b63fc40a39ae51a264d48aa1cdb4cbd0e3339d32856698bf

src/init.cpp

@@ -1083,7 +1083,7 @@ bool AppInitParameterInteraction()
     if (gArgs.IsArgSet("-dustrelayfee"))
     {
         CAmount n = 0;
-        if (!ParseMoney(gArgs.GetArg("-dustrelayfee", ""), n) || 0 == n)
+        if (!ParseMoney(gArgs.GetArg("-dustrelayfee", ""), n))
             return InitError(AmountErrMsg("dustrelayfee", gArgs.GetArg("-dustrelayfee", "")));
         dustRelayFee = CFeeRate(n);
     }