Fix unreachable nil checks in SelectOrganization

Changed SelectOrganization() to return (nil, nil) instead of (nil, error)
when no organizations are found. This allows the nil checks in login.go
and switch.go to be reachable, enabling the friendly error message in
login.go to be displayed as intended.

Author: cursoragent

pkg/helpers/organization.go

@@ -46,7 +46,7 @@ func SelectOrganization() (*Organization, error) {
 	}
 
 	if len(organizations) == 0 {
-		return nil, fmt.Errorf("no organizations found")
+		return nil, nil
 	}
 
 	if len(organizations) == 1 {