Added config error check

Closes #1

Reviewed-on: #2
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

go.mod

@@ -3,7 +3,7 @@ module git.kundeng.us/phoenix/swoosh
 go 1.25.4
 
 require (
-	git.kundeng.us/phoenix/textsender-models v0.0.9
+	git.kundeng.us/phoenix/textsender-models v0.0.10
 	github.com/twilio/twilio-go v1.28.6
 )
 

go.sum

@@ -1,5 +1,5 @@
-git.kundeng.us/phoenix/textsender-models v0.0.9 h1:wHEbDLYzMpXQ8OaIf05xFY1V19iTpQogTJEuKInkjEQ=
-git.kundeng.us/phoenix/textsender-models v0.0.9/go.mod h1:9iPDQJg1Tc6WMNoW5+f8YKmnosMwlWHJ++hmxNLDEe0=
+git.kundeng.us/phoenix/textsender-models v0.0.10 h1:0AMe/zm4Xte2BcuqqhRP7+42m+4To+rUnHkR2a9eXlI=
+git.kundeng.us/phoenix/textsender-models v0.0.10/go.mod h1:9iPDQJg1Tc6WMNoW5+f8YKmnosMwlWHJ++hmxNLDEe0=
 github.com/beevik/etree v1.1.0/go.mod h1:r8Aw8JqVegEf0w2fDnATrX9VpkMcyFeM0FhwO62wh+A=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

swoop/send/sender.go

@@ -5,9 +5,9 @@ import (
 	"fmt"
 	"time"
 
-	"git.kundeng.us/phoenix/textsender-models/pkg/config"
-	"git.kundeng.us/phoenix/textsender-models/pkg/contact"
-	"git.kundeng.us/phoenix/textsender-models/pkg/message"
+	"git.kundeng.us/phoenix/textsender-models/tx0/config"
+	"git.kundeng.us/phoenix/textsender-models/tx0/contact"
+	"git.kundeng.us/phoenix/textsender-models/tx0/message"
 	"github.com/twilio/twilio-go"
 	twilioApi "github.com/twilio/twilio-go/rest/api/v2010"
 
@@ -15,10 +15,13 @@ import (
 )
 
 type MessageSender struct {
-	Config config.TwiloConfig
+	Config *config.TwiloConfig
 }
 
 func (m *MessageSender) Send(msg message.Message, number contact.Contact, sendTime *time.Time) (*types.TwilioResult, error) {
+	if m.Config == nil {
+		return fmt.Errorf("Config has not been initialized")
+	}
 	now := time.Now()
 	client := twilio.NewRestClientWithParams(twilio.ClientParams{
 		Username: m.Config.AccountSID,