fix printjob execution

two bugs here:
- accidently comparing with == instead != against error
- using return instead of continue during for loop

controllers/printController.go

@@ -182,8 +182,9 @@ func (rc *printController) PrintHandler(c *gin.Context) {
 		for _, printJob := range printJobs {
 			err := printJob.Execute()
 
-			if err == nil {
-				return
+			if err != nil {
+				fmt.Printf("Error: %s\n", err)
+				continue
 			}
 
 			printJob.ShopItem.WasPrinted = true
@@ -192,7 +193,6 @@ func (rc *printController) PrintHandler(c *gin.Context) {
 			if err != nil {
 				fmt.Printf("Error: %s\n", err)
 			}
-
 		}
 	}