fix: PackageScanner

assira/src/main/java/net/ranides/assira/reflection/util/PackageScanner.java

@@ -155,7 +155,7 @@ public final class PackageScanner {
                 try {
                     JarEntry entry;
                     while(null != (entry = istream.getNextJarEntry())) {
-                        if(entry.getName().startsWith(croot) && !entry.isDirectory()) {
+                        if((null == croot || entry.getName().startsWith(croot)) && !entry.isDirectory()) {
                             action.accept(entry.getName());
                             return true;
                         }

assira/src/main/java/net/ranides/assira/text/StringUtils.java

@@ -484,7 +484,7 @@ public final class StringUtils {
 
     public static String replace(String text, char search, char newval) {
         if(null == text) {
-            return "";
+            return null;
         }
         final char[] buffer = text.toCharArray();
         for(int i=0; i<buffer.length; i++) {