fix(deployment): load scenarios functionality fixed

Author: FerTV

nebula/frontend/templates/deployment.html

@@ -1256,13 +1256,18 @@ <h5 class="step-title">Schema of deployment</h5>
 
 
                         //Show buttons to move through the list
-                        if (scenarioStorage.scenariosList.length > 1){
+                        if (scenarioStorage.scenariosList.length < 1) {
+                            document.getElementById("prev-btn").style.display = "none";
+                            document.getElementById("run-btn").disabled = true;
+                        }
+                        else if (scenarioStorage.scenariosList.length > 1){
                             document.getElementById("prev-btn").style.display = "inline-block";
                             document.getElementById("run-btn").disabled = false;
                             document.getElementById("del-btn").style.display = "inline-block";
-                        }else{
+                        } else {
                             document.getElementById("prev-btn").style.display = "none";
-                            document.getElementById("run-btn").disabled = true;
+                            document.getElementById("run-btn").disabled = false;
+                            document.getElementById("del-btn").style.display = "inline-block";
                         }
 
                         document.getElementById("new-btn").style.display = "inline-block";