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Description
I've came across a panic caused by an unsafe slice access
`panic: runtime error: index out of range [0] with length 0
goroutine 42 [running]:
github.com/lukasjarosch/go-docx.assembleFullPlaceholders(0xc00056abe0, {0xc000764500, 0x1, 0x2}, {0x0, 0x0, 0x0})
/Users/kav/go/pkg/mod/github.com/lukasjarosch/go-docx@v0.5.0/placeholder.go:272 +0x285
github.com/lukasjarosch/go-docx.ParsePlaceholders({0xc00058e000, 0x112, 0x200}, {0xc0005ee000, 0xc741, 0xe000})
/Users/kav/go/pkg/mod/github.com/lukasjarosch/go-docx@v0.5.0/placeholder.go:196 +0xf4c
github.com/lukasjarosch/go-docx.newDocument(0xc000488508, {0xc0001802a0, 0x57}, 0xc0001916f0)
/Users/kav/go/pkg/mod/github.com/lukasjarosch/go-docx@v0.5.0/document.go:126 +0x7a7
github.com/lukasjarosch/go-docx.Open({0xc0001802a0, 0x57})
/Users/kav/go/pkg/mod/github.com/lukasjarosch/go-docx@v0.5.0/document.go:70 +0x405
main.DocxToPdfClient.InsertDataIntoDocument({}, 0xc0005d82a0, {0x0, 0x0, 0x0}, {0xc0001802a0, 0x57})
/Users/kav/go/src/github.com/EnergyWell/pdf-service/app/docx_to_pdf.go:33 +0x2cf
main.(*MergeFilesToPdfClient).ConvertNonPdfSourceFilesToPdf(0xc00002ba28, {0x24b6590, 0x2c2e740})
/Users/kav/go/src/github.com/EnergyWell/pdf-service/app/merge_pdfs.go:104 +0x1f0
main.(*service).MergeFilesToPdf(0xc0001080f0, {0x24ba590, 0xc0005d8a80}, 0xc0001dc3f0)
/Users/kav/go/src/github.com/EnergyWell/pdf-service/app/pdfservice.go:198 +0xd3e
github.com/EnergyWell/pdf-service/proto._PdfService_MergeFilesToPdf_Handler.func1({0x24ba590, 0xc0005d8a80}, {0x214f740, 0xc0001dc3f0})
/Users/kav/go/src/github.com/EnergyWell/pdf-service/proto/pdf_generator.pb.go:958 +0xf2
github.com/mwitkow/go-grpc-middleware.ChainUnaryServer.func1.1({0x24ba590, 0xc0005d8a80}, {0x214f740, 0xc0001dc3f0})
/Users/kav/go/pkg/mod/github.com/mwitkow/go-grpc-middleware@v1.0.0/chain.go:31 +0xea
github.com/EnergyWell/authorization.(*authorizer).authorizeAdminOnly(0xc000108140, {0x24ba590, 0xc0005d8a80}, {0x214f740, 0xc0001dc3f0}, 0xc00052e520, 0xc0001f48c0)
/Users/kav/go/pkg/mod/github.com/!energy!well/authorization@v0.0.0-20220817035557-04fac2b853fe/authorization.go:132 +0x1a4
github.com/EnergyWell/authorization.(*authorizer).Middleware(0xc000108140, {0x24ba590, 0xc0005d8a80}, {0x214f740, 0xc0001dc3f0}, 0xc00052e520, 0xc0001f48c0)
/Users/kav/go/pkg/mod/github.com/!energy!well/authorization@v0.0.0-20220817035557-04fac2b853fe/authorization.go:68 +0x447
github.com/mwitkow/go-grpc-middleware.ChainUnaryServer.func1.1({0x24ba590, 0xc0005d8a80}, {0x214f740, 0xc0001dc3f0})
/Users/kav/go/pkg/mod/github.com/mwitkow/go-grpc-middleware@v1.0.0/chain.go:34 +0x212
github.com/EnergyWell/auth.(*AuthMiddleware).UnaryMiddleware(0xc0003d4f20, {0x24ba590, 0xc0005d8a80}, {0x214f740, 0xc0001dc3f0}, 0xc00052e520, 0xc0001f48c0)
/Users/kav/go/pkg/mod/github.com/!energy!well/auth@v0.0.0-20220811211414-48e96e06b0ef/middleware.go:77 +0x51a
github.com/mwitkow/go-grpc-middleware.ChainUnaryServer.func1.1({0x24ba590, 0xc0005d8300}, {0x214f740, 0xc0001dc3f0})
/Users/kav/go/pkg/mod/github.com/mwitkow/go-grpc-middleware@v1.0.0/chain.go:34 +0x212
github.com/EnergyWell/service/logger.UnaryMiddleware({0x24ba590, 0xc0005d8300}, {0x214f740, 0xc0001dc3f0}, 0xc00052e520, 0xc0001f48c0)
/Users/kav/go/pkg/mod/github.com/!energy!well/service@v0.0.0-20220127220047-85a8bafcef39/logger/middleware.go:39 +0x3e6
github.com/mwitkow/go-grpc-middleware.ChainUnaryServer.func1({0x24ba590, 0xc0005d8270}, {0x214f740, 0xc0001dc3f0}, 0xc00052e520, 0xc0000121f8)
/Users/kav/go/pkg/mod/github.com/mwitkow/go-grpc-middleware@v1.0.0/chain.go:39 +0x2a6
github.com/EnergyWell/pdf-service/proto._PdfService_MergeFilesToPdf_Handler({0x20f0900, 0xc0001080f0}, {0x24ba590, 0xc0005d8270}, 0xc0001aa420, 0xc000446450)
/Users/kav/go/src/github.com/EnergyWell/pdf-service/proto/pdf_generator.pb.go:960 +0x216
google.golang.org/grpc.(*Server).processUnaryRPC(0xc00044c000, {0x24bdcb8, 0xc0004d1520}, 0xc000504000, 0xc0004762a0, 0x2bec360, 0x0)
/Users/kav/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1282 +0x15e3
google.golang.org/grpc.(*Server).handleStream(0xc00044c000, {0x24bdcb8, 0xc0004d1520}, 0xc000504000, 0x0)
/Users/kav/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1616 +0x891
google.golang.org/grpc.(*Server).serveStreams.func1.2()
/Users/kav/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:921 +0x117
created by google.golang.org/grpc.(*Server).serveStreams.func1 in goroutine 57
/Users/kav/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:919 +0x385`