0038420: When navigating to POS if no supervisor, toolbar buttons disappear

# HG changeset patch
# User Adrián Romero <adrianromero@openbravo.com>
# Date 1524220395 -7200
#      Fri Apr 20 12:33:15 2018 +0200
# Node ID 8764a3be8752e3b4db64749ab5dd95552a2145ea
# Parent  c0b98dc41669ec0b1827388b8e11aedcc1a9d5e3
Fixes issue 0038420: When navigating to POS if no supervisor, toolbar buttons disappear

diff --git a/web/org.openbravo.retail.selfcheckout/source/components/applicationEngine.js b/web/org.openbravo.retail.selfcheckout/source/components/applicationEngine.js
--- a/web/org.openbravo.retail.selfcheckout/source/components/applicationEngine.js
+++ b/web/org.openbravo.retail.selfcheckout/source/components/applicationEngine.js
@@ -218,6 +218,10 @@
     if (!this._initialized) {
       throw 'Do not invoke showLoading if not initialized.';
     }
+    if (this.state.get('loading')) {
+      return; // Already shown
+    }
+
     var data = {
       event: {},
       state: this.state,
@@ -233,6 +237,10 @@
     if (!this._initialized) {
       throw 'Do not invoke hideLoading if not initialized.';
     }
+    if (!this.state.get('loading')) {
+      return; // Already hidden
+    }
+
     var data = {
       event: {},
       state: this.state,