Replace Throwable with SecurityException in ResourceUtil

Author: pavel-alay

io/src/main/java/com/itextpdf/io/util/ResourceUtil.java

@@ -88,8 +88,7 @@ public static InputStream getResourceStream(String key, ClassLoader loader) {
             if (contextClassLoader != null) {
                 stream = contextClassLoader.getResourceAsStream(key);
             }
-        } catch (Throwable e) {
-            // empty body
+        } catch (SecurityException ignored) {
         }
 
         if (stream == null) {

io/src/test/java/com/itextpdf/io/UtilitiesTest.java

@@ -43,6 +43,7 @@ This file is part of the iText (R) project.
 package com.itextpdf.io;
 
 import com.itextpdf.io.util.ArrayUtil;
+import com.itextpdf.io.util.ResourceUtil;
 import com.itextpdf.test.annotations.type.UnitTest;
 import org.junit.Assert;
 import org.junit.Test;
@@ -58,4 +59,9 @@ public void testShortener() {
 
         Assert.assertArrayEquals(dest, test);
     }
+
+    @Test
+    public void invalidResource() {
+        Assert.assertNull(ResourceUtil.getResourceStream("some-random-resource.zzz"));
+    }
 }