update ph.toUnit: show value 0

inc_pluginfunctions

@@ -320,6 +320,12 @@ function ph.toUnit(){
     local _value=$1
     local _unit=$2
     local _digits=${3:-0}
+    local _dots
+
+    if [ "$_value" -eq "0" ]; then
+      echo "0"
+      return 0
+    fi
 
     local _multiply; _multiply=$( ph._getExp "$_value" )
     local _divisor;  _divisor=$(  ph._getExp "$_unit"  )
@@ -327,7 +333,6 @@ function ph.toUnit(){
     local _bc
     _bc="bc"
 
-    local _dots
 
     test $_digits -gt 0 && _dots=$( yes "." 2>/dev/null | head -$_digits | tr -d "\n" )
     test $_digits -gt 0 && _bc+=" -l | grep -o '.*\\.${_dots}'"