added css to marketplace logo if logo is broken

css/organizr.css

@@ -4904,4 +4904,22 @@ td.mouse-grab.sort-tabs-handle {
 .orgLogDiv select, .orgLogDiv input {
     padding: 8px;
     border-radius: 4px;
+}
+#managePluginTable img:before {
+    content: "loading";
+    height: 45px;
+    width: 45px;
+    display: block;
+}
+#managePluginTable img:after {
+    content: "";
+    display: block;
+    position: absolute;
+    z-index: 2;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background: url("../../plugins/images/organizr/logo-purple-square.png") no-repeat center center;
+    background-size: auto 100%;
 }