Add Checkstyle EmptyBlock

Author: garydgregory

src/conf/checkstyle.xml

@@ -52,6 +52,9 @@ limitations under the License.
     <module name="AvoidStarImport" />
     <module name="CovariantEquals" />
     <module name="DefaultComesLast" />
+    <module name="EmptyBlock">
+      <property name="option" value="text" />
+    </module>
     <module name="ExplicitInitializationCheck" />
     <module name="FinalLocalVariable" />
     <module name="IllegalImport" />

src/main/java/org/apache/commons/codec/language/Metaphone.java

@@ -227,6 +227,7 @@ public String metaphone(final String txt) {
             final char symb = local.charAt(n);
             // remove duplicate letters except C
             if (symb != 'C' && isPreviousChar(local, n, symb)) {
+                // empty
             } else { // not dup
                 switch (symb) {
                 case 'A':