provide null monitor instead of null

Author: jantje

io.sloeber.core/src/io/sloeber/core/api/LibraryManager.java

@@ -194,7 +194,7 @@ public static void installAllLatestLibraries() {
                         if (installedLibVersion != null) {
                             unInstall(installedLibVersion, null);
                         }
-                        install(latestLibVersion, null);
+                        install(latestLibVersion, new NullProgressMonitor());
                     }
                 }
             }