Fixes git-resolver configuration for serverUrl and scmType

With the latest support for multiple git providers in git-resolvers,
it was having a regression issue where if value serverUrl was not given
then it used to return an error

Hence this patch fixes the issue to avoid regression

Signed-off-by: PuneetPunamiya <ppunamiy@redhat.com>

pkg/resolution/resolver/git/resolver.go

@@ -530,18 +530,12 @@ func getSCMTypeAndServerURL(ctx context.Context, params map[string]string) (stri
 	}
 	if scmType == "" {
 		scmType = conf.SCMType
-		if scmType == "" {
-			return "", "", fmt.Errorf("missing or empty %s value in configmap", SCMTypeKey)
-		}
 	}
 	if key, ok := params[ServerURLParam]; ok {
 		serverURL = key
 	}
 	if serverURL == "" {
 		serverURL = conf.ServerURL
-		if serverURL == "" {
-			return "", "", fmt.Errorf("missing or empty %s value in configmap", ServerURLKey)
-		}
 	}
 	return scmType, serverURL, nil
 }