added error method missing text and implemented indexOutput and print to throw it when empty

src/TextOutput.java

@@ -14,7 +14,10 @@ public class TextOutput {
      * @param text the ArrayList which is then formatted into the desired output.
      */
     public void print(ArrayList<String> text) {
-        if (formatRaw) {
+        if(text.size() == 0) {
+            errorMissingText();
+        }
+        else if (formatRaw) {
             printFormated(text);
         } else {
             toFormat(text);
@@ -112,8 +115,13 @@ public class TextOutput {
      * @param index ArrayList with words and in which part they have
      */
     public void indexOutput(ArrayList<String> index) {
-        for (String word : index) {
-            System.out.println(word);
+        if(index.size() == 0) {
+            errorMissingText();
+        }
+        else {
+            for (String word : index) {
+                System.out.println(word);
+            }
         }
     }
 
@@ -130,4 +138,11 @@ public class TextOutput {
     public void errorInvalidCommand() {
         System.err.println("Invalid Command");
     }
+
+    /**
+     * Method to give out the Error "Missing Text".
+     */
+    public void errorMissingText() {
+        System.err.println("Missing Text");
+    }
 }