I'm new to Apex. I would appreciete if somebody can help me with these codes. I can't seem to cover them on my test class. both else statement were the only one's not covered. 

Delete Contact

public static void processBeforeDeleteTrigger(List<Contact> oldContact, Map<Id, Contact> oldContactMap){
        Id accountRelatedID;
        for(Contact con : oldContact){
            accountRelatedID = con.AccountID;
        }
        Account relatedAccount = [SELECT Id, (SELECT ID FROM Contacts) FROM Account WHERE Id =:accountRelatedID];
        List<Contact> conList = new List<Contact>(relatedAccount.Contacts);
        system.debug('number of contacts' + conList.size());
        if(conList.size()==1){
             //this part is not covered
            oldContact[0].addError('Remaining contact cannot be deleted!');
        }

    }

Test Class

public static void deleteContactTEST() {
        Account newAccount = new Account(Name='Test Account Name');
        insert newAccount;
         List<Contact> newContact = new List<Contact>();
         for (Integer count = 0; count < 50; count++) {
             newContact.add(new Contact (LastName=' Test Contact Name' + count, AccountId = newAccount.Id));
         }
        insert newContact;
        Test.startTest();
         Boolean status = RelatedContactController.deleteContact(newContact[0].id);
        Test.stopTest();
         
         List<Contact> getContact = [SELECT Id FROM Contact WHERE AccountId = :newAccount.Id];
         System.assertEquals ( 49 , getContact.size());
         System.assertEquals ( true , status);
         
     }

Search Account

public static string searchQuery(String searchKey, Integer recordToDisply) {
        String name = '%' + searchKey + '%';
        //String finalString = name.replaceAll('\\p{Punct}', '');
        String soqlInject = String.escapeSingleQuotes(name);
        //String SOQL = 'SELECT Id, Name,(select Id from Contacts) FROM Account WHERE Name LIKE :\'' + soqlInject + '\'' + 'ORDER BY Name LIMIT :recordToDisply';
        List<Object> accountList= new List<Object>();
        //Implement a Search Query with SOQL when conditions are met
        if(searchKey!='' || searchKey != null){
            accountList = [SELECT Id, Name,(select Id from Contacts) FROM Account WHERE Name LIKE : soqlInject ORDER BY Name LIMIT :recordToDisply];
        }
        else{
            //this is not covered
            accountList = [SELECT Id, Name,(select Id from Contacts) FROM Account ORDER BY Name LIMIT :recordToDisply];
        }
        //convert data types into JSON format
        return JSON.serialize(accountList);
    }

Test class:

public static void findByNameTest(){
        Integer count = [select count() from account];
        test.startTest();
        List<Object> test4 = (List<Object>)JSON.deserializeUntyped(AccountContactController.searchQuery('Test',6));
        List<Object> test5 = (List<Object>)JSON.deserializeUntyped(AccountContactController.searchQuery('',30));
        test.stopTest();
        system.assertEquals(6, test4.size());
        system.assertEquals(count, test5.size());
    }