Hold error count raise when report is held

Update held report mechanism to also hold error count to raise when
activated. With this change no more error is rendered when a requirement
cannot be loaded but an alternative one can.

Fixes #510

NEWS.rst

@@ -61,6 +61,8 @@ Modules 5.4.0 (not yet released)
   understand the chronology of actions and from where an error occurs.
 * Do not report requirement load error when an an alternative requirement
   module is found and loaded afterward. (fix issue #509)
+* Do not render an error exit code on multi-module option requirement when
+  one module option fails to load but another does. (fix issue #510)
 
 
 .. _5.3 release notes:

tcl/envmngt.tcl.in

@@ -21,7 +21,13 @@
 ##########################################################################
 
 proc raiseErrorCount {} {
-   setState error_count [expr {[getState error_count] + 1}]
+   # hold error count raise
+   if {[depthState reportholdid] > 0} {
+      lappend ::g_holdReport([currentState reportholdid]) [list\
+         raiseErrorCount]
+   } else {
+      setState error_count [expr {[getState error_count] + 1}]
+   }
 }
 
 proc renderFalse {} {