Current buffer is duplicated on terminal resize when Prompt is empty

1. Similar to AESH-475, modify Example.java to create an empty prompt.
2. Type some input like "thisissomeinput"
3. Resize the terminal window
4. Observe that the buffer contents have been duplicated: "thisissomeinputthisissomeinput"
5. This duplication occurs on every resize.
Note: The cursor will not move out of bounds of the original length of the input before duplication. So for the example above, the cursor will only traverse the last "copy" of input in the buffer, in this case the last "thisissomeinput"

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