tdf#42982 Improve UNO API error reporting

Change-Id: I2fb3f830c6f44a59917b1ed5b1d50dd4f0000000
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/196355
Tested-by: Jenkins
Reviewed-by: Ilmari Lauhakangas <ilmari.lauhakangas@libreoffice.org>

connectivity/source/commontools/dbexception.cxx

@@ -242,7 +242,7 @@ void SQLExceptionInfo::doThrow()
 {
     if ( m_aContent.getValueTypeClass() == TypeClass_EXCEPTION )
         ::cppu::throwException( m_aContent );
-    throw RuntimeException();
+    throw RuntimeException("SQLExceptionInfo::doThrow: no valid exception content");
 }
 
 SQLExceptionIteratorHelper::SQLExceptionIteratorHelper( const SQLExceptionInfo& _rChainStart )

connectivity/source/commontools/paramwrapper.cxx

@@ -71,7 +71,7 @@ namespace dbtools::param
         if ( m_xDelegator.is() )
             m_xDelegatorPSI = m_xDelegator->getPropertySetInfo();
         if ( !m_xDelegatorPSI.is() )
-            throw RuntimeException();
+            throw RuntimeException("ParameterWrapper: PropertySetInfo is not available");
     }
 
 
@@ -85,7 +85,7 @@ namespace dbtools::param
         if ( m_xDelegator.is() )
             m_xDelegatorPSI = m_xDelegator->getPropertySetInfo();
         if ( !m_xDelegatorPSI.is() )
-            throw RuntimeException();
+            throw RuntimeException("ParameterWrapper: PropertySetInfo is not available");
 
         OSL_ENSURE( !m_aIndexes.empty(), "ParameterWrapper::ParameterWrapper: sure about the indexes?" );
     }