Change to throw context exception as lack of value in context is the reason for PropertyException.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@269299 13f79535-47bb-0310-9956-ffa450edef68

proposal/myrmidon/src/java/org/apache/myrmidon/framework/Condition.java

@@ -42,7 +42,7 @@ public class Condition
     }
 
     public boolean evaluate( final Context context )
-        throws TaskException
+        throws ContextException
     {
         boolean result = false;
 
@@ -66,7 +66,7 @@ public class Condition
         }
         catch( final PropertyException pe )
         {
-            throw new TaskException( "Error resolving " + m_condition, pe );
+            throw new ContextException( "Error resolving " + m_condition, pe );
         }
 
         if( !m_isIfCondition )