Remove unused code (#20)

String comparison must be done with .equals() so that the comparison is not done at the object level.

However, if done correctly here, it would lead to a NullPointerException in getFirstToken(). getFirstToken() is actually able to correctly handle empty lines and will return a null string in that case, which is properly handled by the calling code.

Therefore, remove unused code.

src/main/java/at/medunigraz/imi/bst/n2c2/model/Patient.java

@@ -66,8 +66,7 @@ public ArrayList<PatientVisits> getAllVisits(){
     		PatientVisits pv = new PatientVisits(); 
 
     		pv.setVisit_number(i);
-    		String line = visits[i].trim(); 
-    		if(line == "") line = null; 
+    		String line = visits[i].trim();
 
 			String s_date = getFirstToken(line); 
 			if(s_date != null){