data: record Clang Invocation errors as errors when nothing is recorded

src/lib/data/parser/ParserClient.h

@@ -32,6 +32,8 @@ public:
 	virtual void recordComment(const ParseLocation& location) = 0;
 
 	virtual void recordError(const std::wstring& message, bool fatal, bool indexed, const FilePath& translationUnit, const ParseLocation& location) = 0;
+
+	virtual bool hasContent() const = 0;
 };
 
 #endif // PARSER_CLIENT_H

src/lib/data/parser/ParserClientImpl.cpp

@@ -99,6 +99,11 @@ void ParserClientImpl::recordError(
 	}
 }
 
+bool ParserClientImpl::hasContent() const
+{
+	return m_storage->getByteSize(1) > 0;
+}
+
 NodeType ParserClientImpl::symbolKindToNodeType(SymbolKind symbolKind) const
 {
 	switch (symbolKind)

src/lib/data/parser/ParserClientImpl.h

@@ -31,6 +31,8 @@ public:
 
 	void recordError(const std::wstring& message, bool fatal, bool indexed, const FilePath& translationUnit, const ParseLocation& location) override;
 
+	bool hasContent() const override;
+
 private:
 	NodeType symbolKindToNodeType(SymbolKind symbolType) const;
 	Edge::EdgeType referenceKindToEdgeType(ReferenceKind referenceKind) const;