Set default values for upper and leaf branch lengths in halAddToBranch tool (#7673)

Author: SaimMomin12

tools/haltools/hal_halAddToBranch.xml

@@ -35,8 +35,8 @@
         </param>
         <param name="topAlignmentFile" type="data" format="hal" label="Top alignment file" help="HAL file defining the connection between the parent and the new insert. A tree containing the insert, its parent, and its siblings"/>
         <param name="botAlignmentFile" type="data" format="hal" label="Bottom alignment file" help="HAL file defining the subtree starting from the new insert node. A tree containing the insert, its children, and its new leaf genome"/>
-        <param name="upperBranchLength" type="float" min="0" label="Upper branch length" help="Length of branch from parent to insert"/>
-        <param name="leafBranchLength" type="float" min="0" label="Leaf branch length" help="Leaf branch length"/>
+        <param name="upperBranchLength" type="float" value="1" min="0" label="Upper branch length" help="Length of branch from parent to insert"/>
+        <param name="leafBranchLength" type="float" value="1" min="0" label="Leaf branch length" help="Leaf branch length"/>
         <expand macro="params_noMarkAncestors"/>
     </inputs>
     <outputs>