addressed Jae's comments

baseapp/baseapp.go

@@ -370,6 +370,9 @@ func handleQueryP2P(app *BaseApp, path []string, req abci.RequestQuery) (res abc
 func handleQueryCustom(app *BaseApp, path []string, req abci.RequestQuery) (res abci.ResponseQuery) {
 	// path[0] should be "custom" because "/custom" prefix is required for keeper queries.
 	// the queryRouter routes using path[1]. For example, in the path "custom/gov/proposal", queryRouter routes using "gov"
+	if path[1] == "" {
+		sdk.ErrUnknownRequest("No route for custom query specified").QueryResult()
+	}
 	querier := app.queryRouter.Route(path[1])
 	ctx := app.checkState.ctx
 	// Passes the rest of the path as an argument to the querier.
@@ -378,6 +381,7 @@ func handleQueryCustom(app *BaseApp, path []string, req abci.RequestQuery) (res
 	if err != nil {
 		return abci.ResponseQuery{
 			Code: uint32(err.ABCICode()),
+			Log:  err.ABCILog(),
 		}
 	}
 	return abci.ResponseQuery{

baseapp/queryrouter.go

@@ -10,14 +10,8 @@ type QueryRouter interface {
 	Route(path string) (h sdk.Querier)
 }
 
-// map a transaction type to a handler and an initgenesis function
-type queryroute struct {
-	r string
-	h sdk.Querier
-}
-
 type queryrouter struct {
-	routes []queryroute
+	routes map[string]sdk.Querier
 }
 
 // nolint
@@ -25,27 +19,23 @@ type queryrouter struct {
 // TODO either make Function unexported or make return type (router) Exported
 func NewQueryRouter() *queryrouter {
 	return &queryrouter{
-		routes: make([]queryroute, 0),
+		routes: map[string]sdk.Querier{},
 	}
 }
 
-// AddRoute - TODO add description
-func (rtr *queryrouter) AddRoute(r string, h sdk.Querier) QueryRouter {
+// AddRoute - Adds an sdk.Querier to the route provided. Panics on duplicate
+func (rtr *queryrouter) AddRoute(r string, q sdk.Querier) QueryRouter {
 	if !isAlphaNumeric(r) {
 		panic("route expressions can only contain alphanumeric characters")
 	}
-	rtr.routes = append(rtr.routes, queryroute{r, h})
-
+	if rtr.routes[r] != nil {
+		panic("route has already been initialized")
+	}
+	rtr.routes[r] = q
 	return rtr
 }
 
-// Route - TODO add description
-// TODO handle expressive matches.
+// Returns the sdk.Querier for a certain route path
 func (rtr *queryrouter) Route(path string) (h sdk.Querier) {
-	for _, route := range rtr.routes {
-		if route.r == path {
-			return route.h
-		}
-	}
-	return nil
+	return rtr.routes[path]
 }

types/account.go

@@ -111,13 +111,19 @@ func (bz AccAddress) Format(s fmt.State, verb rune) {
 
 // Returns boolean for whether two AccAddresses are Equal
 func (bz AccAddress) Equals(bz2 AccAddress) bool {
+	if bz.Empty() && bz2.Empty() {
+		return true
+	}
 	return (bytes.Compare(bz.Bytes(), bz2.Bytes()) == 0)
 }
 
 // Returns boolean for whether an AccAddress is empty
 func (bz AccAddress) Empty() bool {
+	if bz == nil {
+		return true
+	}
 	bz2 := AccAddress{}
-	return bz.Equals(bz2)
+	return (bytes.Compare(bz.Bytes(), bz2.Bytes()) == 0)
 }
 
 //__________________________________________________________
@@ -206,13 +212,19 @@ func (bz ValAddress) Format(s fmt.State, verb rune) {
 
 // Returns boolean for whether two ValAddresses are Equal
 func (bz ValAddress) Equals(bz2 ValAddress) bool {
+	if bz.Empty() && bz2.Empty() {
+		return true
+	}
 	return (bytes.Compare(bz.Bytes(), bz2.Bytes()) == 0)
 }
 
 // Returns boolean for whether an AccAddress is empty
 func (bz ValAddress) Empty() bool {
+	if bz == nil {
+		return true
+	}
 	bz2 := ValAddress{}
-	return bz.Equals(bz2)
+	return (bytes.Compare(bz.Bytes(), bz2.Bytes()) == 0)
 }
 
 // Bech32ifyAccPub takes AccountPubKey and returns the bech32 encoded string