video without url doesnt appear

static/js/d3_map.js

@@ -30,8 +30,12 @@ d3.json("/static/js/group1.json", function(error, json) {
   var node = svg.selectAll(".node")
     .data(json.nodes)
     .enter().append("g")
-      .attr("class", function(d){return "node group" + d.group})
+    .attr("class", function(d) {
-      .attr("id", function(d){return d.id});
+      return "node group" + d.group
+    })
+    .attr("id", function(d) {
+      return d.id
+    });
 
   node.append("image")
     // .attr("xlink:href", "/static/images/squig2.png")
@@ -45,7 +49,9 @@ d3.json("/static/js/group1.json", function(error, json) {
     // .attr("xlink:href", "#")
     .attr("dx", 12)
     .attr("dy", ".35em")
-          .text(function(d) { return d.name });
+    .text(function(d) {
+      return d.name
+    });
 
 
   var divVideo = d3.select("body").append("div").style("opacity", 1);
@@ -56,11 +62,14 @@ var divBio = d3.select("body").append("div").style("opacity", 1);
   node.on({
       "mouseover": function(d) {
         d3.select(this).style("cursor", "pointer");
-        }})
+      }
+    })
     .on("click", function(i) {
       // popup video
+      if (i.url) {
         divVideo.transition().duration(100);
         divVideo.html("<div id='showvideo'><span onclick=this.parentElement.style.display='none';pauseAllVideos(" + i.id + "); class='topleft'> &nbsp; &times&nbsp;</span><iframe id='video" + i.id + "' width='300' height='150' src='" + i.url + "' frameborder='0' allow='accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture' allowfullscreen></iframe></div>");
+      }
       divBio.transition().duration(100);
       divBio.html("<div id='showbio'><span onclick=this.parentElement.style.display='none' class='topleft'> &nbsp; &times&nbsp;</span><div id='bio" + i.id + "'>" + i.bio + "</div>");
       // draggable
@@ -77,12 +86,22 @@ var divBio = d3.select("body").append("div").style("opacity", 1);
 
 
   force.on("tick", function() {
-        link.attr("x1", function(d) { return d.source.x; })
+    link.attr("x1", function(d) {
-            .attr("y1", function(d) { return d.source.y; })
+        return d.source.x;
-            .attr("x2", function(d) { return d.target.x; })
+      })
-            .attr("y2", function(d) { return d.target.y; });
+      .attr("y1", function(d) {
+        return d.source.y;
+      })
+      .attr("x2", function(d) {
+        return d.target.x;
+      })
+      .attr("y2", function(d) {
+        return d.target.y;
+      });
 
-        node.attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; });
+    node.attr("transform", function(d) {
+      return "translate(" + d.x + "," + d.y + ")";
+    });
 
   });
 
@@ -108,6 +127,7 @@ json.links.forEach(function (d) {
   function neighboring(a, b) {
     return linkedByIndex[a.index + "," + b.index];
   }
+
   function connectedNodes() {
     if (toggle == 0) {
       //Reduce the opacity of all but the neighbouring nodes