MQTT: WIP supporting structured types : do not crash when generating C code if using location with no size
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<fileHeader companyName="SMARTEH d.o.o." productName="LHC2_GOT_012" productVersion="1.1.359" creationDateTime="2024-07-25T15:43:22"/>
<contentHeader name="mqtt" modificationDateTime="2024-08-21T17:05:30">
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<type>
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<position x="173" y="47"/>
<connectionPointOut>
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<expression>LocalVar0</expression>
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<outVariable localId="2" executionOrderId="0" height="26" width="82" negated="false">
<position x="482" y="47"/>
<connectionPointIn>
<relPosition x="0" y="13"/>
<connection refLocalId="1">
<position x="482" y="60"/>
<position x="255" y="60"/>
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<outVariable localId="3" executionOrderId="0" height="26" width="82" negated="false">
<position x="479" y="140"/>
<connectionPointIn>
<relPosition x="0" y="13"/>
<connection refLocalId="4">
<position x="479" y="153"/>
<position x="365" y="153"/>
<position x="365" y="168"/>
<position x="252" y="168"/>
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<expression>LocalVar2</expression>
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<position x="170" y="155"/>
<connectionPointOut>
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<task name="main_task" priority="0" interval="T#1000ms">
<pouInstance name="instance0" typeName="program0"/>
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