export IDF without empty PLACEMENT section

utils/idftools/idf_parser.cpp

@@ -3053,6 +3053,27 @@ void IDF3_BOARD::writeBoardFile( const std::string& aFileName )
             std::map< std::string, IDF3_COMPONENT*>::iterator itcs = components.begin();
             std::map< std::string, IDF3_COMPONENT*>::iterator itce = components.end();
 
+            // determine if there are any component outlines at all and avoid
+            // writing an empty PLACEMENT section if there are no outlines.
+            // this will cost a little time but prevents software such as
+            // CircuitWorks from segfaulting on an empty section.
+
+            bool hasOutlines = false;
+
+            while( itcs != itce )
+            {
+                if( itcs->second->GetOutlinesSize() > 0 )
+                {
+                    itcs = components.begin();
+                    hasOutlines = true;
+                    break;
+                }
+
+                ++itcs;
+            }
+
+            if( hasOutlines )
+            {
                 brd << ".PLACEMENT\n";
 
                 while( itcs != itce )
@@ -3065,6 +3086,8 @@ void IDF3_BOARD::writeBoardFile( const std::string& aFileName )
             }
 
         }
+
+    }
     catch( const std::exception& e )
     {
         brd.exceptions( std::ios_base::goodbit );