hide plugins update message when no plugins detected (IDEA-77862)

(cherry picked from commit c76da5bb27fef3c16944e8b53f13b64905a5d63e)

platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/NoUpdatesDialog.java

@@ -64,9 +64,11 @@ class NoUpdatesDialog extends AbstractUpdateDialog {
     private JPanel myPluginsPanel;
     private JEditorPane myEditorPane;
     private JLabel myNothingFoundToUpdateLabel;
+    private JLabel myPluginsToUpdateLabel;
 
     public NoUpdatesPanel() {
       initPluginsPanel(myPanel, myPluginsPanel, myEditorPane);
+      myPluginsToUpdateLabel.setVisible(myUploadedPlugins != null);
       myNothingFoundToUpdateLabel.setVisible(myUploadedPlugins == null);
       myNothingFoundToUpdateLabel.setText("You already have the latest version of " +
                                           ApplicationInfo.getInstance().getVersionName()+ " installed.");

platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/NoUpdatesPanel.form

@@ -7,7 +7,7 @@
     <properties/>
     <border type="none"/>
     <children>
-      <component id="6b492" class="javax.swing.JLabel">
+      <component id="6b492" class="javax.swing.JLabel" binding="myPluginsToUpdateLabel">
         <constraints>
           <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="1" fill="1" indent="0" use-parent-layout="false"/>
           <gridbag top="0" left="0" bottom="3" right="0" weightx="1.0" weighty="0.0"/>
@@ -52,7 +52,7 @@
         <properties>
           <contentType value="text/html"/>
           <maximumSize width="2147483647" height="25"/>
-          <text value="&lt;html&gt;&#13;&#10;  &lt;head&gt;&#13;&#10;&#13;&#10;  &lt;/head&gt;&#13;&#10;  &lt;body&gt;&#13;&#10;    &lt;p style=&quot;margin-top: 0&quot;&gt;&#13;&#10;      &#13;&#10;    &lt;/p&gt;&#13;&#10;  &lt;/body&gt;&#13;&#10;&lt;/html&gt;&#13;&#10;"/>
+          <text value="&lt;html&gt;&#13;&#10;  &lt;head&gt;&#13;&#10;    &#13;&#10;  &lt;/head&gt;&#13;&#10;  &lt;body&gt;&#13;&#10;  &lt;/body&gt;&#13;&#10;&lt;/html&gt;&#13;&#10;"/>
         </properties>
       </component>
       <vspacer id="bf1d9">