| Fixing Issue #155 by removing check for "isEmpty" on passed bounds to add. This makes add(PBounds) fall in line with the add(x, y) method. | 
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| core/src/main/java/edu/umd/cs/piccolo/util/PBounds.java | 
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| core/src/test/java/edu/umd/cs/piccolo/util/PBoundsTest.java | 
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