[Search] Searching parameters by 'Annotation ID' makes NeuroCurator crash

[pafonta]

Steps:

1. Choose 'Annotation ID' in the 'Search conditions' panel in the tab 'Parameters'.
2. Enter an annotation ID (ex: 0ec14d5c-ed2a-11e5-b291-3417ebb8f5ca).
3. Click on 'Search'.
4. NeuroCurator crashes (v0.4.4 but not v0.4.3 even if the exception is the same).

Stack trace:

Traceback (most recent call last):
  File "/Users/fonta/repos/neurocurator/neurocurator/searchInterface.py", line 103, in search
    result = searcher.search()
  File "/Users/fonta/repos/nat/nat/annotationSearch.py", line 227, in search
    self.selectedItems = self.conditions.apply_param(self.parameters)
  File "/Users/fonta/repos/nat/nat/condition.py", line 155, in apply_param
    results =  {param:annot for param, annot in parameters.items() 
  File "/Users/fonta/repos/nat/nat/condition.py", line 156, in <dictcomp>
    if checkParameter(param, annot, self.key, self.value)}  
  File "/Users/fonta/repos/nat/nat/condition.py", line 73, in checkParameter
    return annotation.annotId == value        
AttributeError: 'Annotation' object has no attribute 'annotId'