[FAB-3396] Fixed "index out of range" error

Invoking register command with '--id.attr foo=bar' will
result in 'index out of range' error. This error will
also happen if the client configuration file either
does not have 'id.attributes' property or no members
are specified in the 'id.attributes' list property.
This problem surfaced after the 'id.attributes' was changed
to 'id.attrs' in the client configuration template in the
FAB-3107

Change-Id: Idd5da7085ebe54420268d77d1d332a3cda9f34d5
Signed-off-by: Anil Ambati <[email protected]>

cmd/fabric-ca-client/config.go

@@ -25,6 +25,7 @@ import (
 	"strings"
 
 	"github.com/cloudflare/cfssl/log"
+	"github.com/hyperledger/fabric-ca/api"
 	"github.com/hyperledger/fabric-ca/lib"
 	"github.com/hyperledger/fabric-ca/util"
 	"github.com/spf13/viper"
@@ -123,7 +124,7 @@ id:
   name:
   type:
   affiliation:
-  attrs:
+  attributes:
     - name:
       value:
 
@@ -255,6 +256,9 @@ func createDefaultConfigFile() error {
 // processAttributes parses attributes from command line
 func processAttributes() {
 	splitAttr := strings.Split(clientCfg.ID.Attr, "=")
+	if len(clientCfg.ID.Attributes) == 0 {
+		clientCfg.ID.Attributes = make([]api.Attribute, 1)
+	}
 	clientCfg.ID.Attributes[0].Name = splitAttr[0]
 	clientCfg.ID.Attributes[0].Value = strings.Join(splitAttr[1:], "")
 }