remove some fatal vioelent exits

client/helpers/backgroundHelper.go

@@ -2,7 +2,6 @@ package helpers
 
 import (
 	"errors"
-	"log"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -159,7 +158,7 @@ func ReadMessage(messageFilename string) ([]string, []string, string, error) {
 				if _, err := os.Stat(filepath.Join(client.GetConfig().StoragePath, identity.Uuid, "files")); os.IsNotExist(err) {
 					err = os.MkdirAll(filepath.Join(client.GetConfig().StoragePath, identity.Uuid, "files"), 0700)
 					if err != nil {
-						log.Fatal(err)
+						return nil, nil, "ReadMessage: MkdirAll", err
 					}
 				}
 				for _, file := range usermsg.Files {

contactcard.go

@@ -8,7 +8,6 @@ import (
 	"image/color"
 	"image/png"
 	"io"
-	"log"
 	"math"
 	"os"
 
@@ -101,7 +100,7 @@ func (contact *ContactCard) WriteCompressed(filename string) error {
 	return nil
 }
 
-func (contact *ContactCard) WritePng(filename string) {
+func (contact *ContactCard) WritePng(filename string) error {
 	out, err := proto.Marshal(contact)
 	if err != nil {
 		println(err)
@@ -128,18 +127,18 @@ func (contact *ContactCard) WritePng(filename string) {
 
 	f, err := os.Create(filename)
 	if err != nil {
-		log.Fatal(err)
+		return err
 	}
 
 	if err := png.Encode(f, img); err != nil {
 		f.Close()
-		log.Fatal(err)
+		return err
 	}
 
 	if err := f.Close(); err != nil {
-		log.Fatal(err)
+		return err
 	}
-
+	return nil
 }
 
 func (Contact *ContactCard) WriteQr(filename string) error {