Fix case where avatar may be null (ribot#44)

* Fix case where avatar may be null * Remove unwanted space * Remove robot avatar and revert back to display of hex colour

Author: hitherejoe

app/src/main/java/uk/co/ribot/androidboilerplate/data/local/Db.java

@@ -30,7 +30,7 @@ public abstract static class RibotProfileTable {
  COLUMN_LAST_NAME + " TEXT NOT NULL, " +
  COLUMN_HEX_COLOR + " TEXT NOT NULL, " +
  COLUMN_DATE_OF_BIRTH + " INTEGER NOT NULL, " +
- COLUMN_AVATAR + " TEXT NOT NULL, " +
+ COLUMN_AVATAR + " TEXT, " +
  COLUMN_BIO + " TEXT" +
  " ); ";
 

app/src/main/java/uk/co/ribot/androidboilerplate/ui/main/RibotsAdapter.java

@@ -38,7 +38,7 @@ public RibotViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
  }
 
  @Override
- public void onBindViewHolder(RibotViewHolder holder, int position) {
+ public void onBindViewHolder(final RibotViewHolder holder, int position) {
  Ribot ribot = mRibots.get(position);
  holder.hexColorView.setBackgroundColor(Color.parseColor(ribot.profile.hexColor));
  holder.nameTextView.setText(String.format("%s %s",