.format_tbl() in pdb.annotate() cannot handle "source" with no value

Hi

Thank you @Xinqiu Yao for updating pdb.annotate() to accommodate the RCSB’s new API!

I found a bug related to querying the RCSB for multiple structures. When one of the structures has multiple chains but the number of “sources” does not match the number of chains an error is returned.

bio3d::pdb.annotate(unique=FALSE, ids=c("4os7", "4x0w"))
Error in `$<-.data.frame`(`*tmp*`, "source", value = c("Homo sapiens",  : 
  replacement has 3 rows, data has 4

I am using the most recent version of bio3d from Bitbucket.

install_bitbucket("Grantlab/bio3d", subdir = "ver_devel/bio3d/")
Skipping install of 'bio3d' from a bitbucket remote, the SHA1 (59a3a60d) has not changed since last install.
  Use `force = TRUE` to force installation

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Will submit updated code and update issue with the pull request. The updated file is also attached.

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> sessionInfo()
R version 4.0.3 (2020-10-10)
Platform: x86_64-apple-darwin17.0 (64-bit)
Running under: macOS Catalina 10.15.7

Matrix products: default
BLAS:   /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libBLAS.dylib
LAPACK: /Library/Frameworks/R.framework/Versions/4.0/Resources/lib/libRlapack.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
 [1] devtools_2.4.2   usethis_2.0.1    cowplot_1.1.1    reshape2_1.4.4   bio3d_2.4-2.9000 vanddraabe_1.1.2 forcats_0.5.1    stringr_1.4.0    dplyr_1.0.6      purrr_0.3.4      readr_1.4.0      tidyr_1.1.3      tibble_3.1.2    
[14] ggplot2_3.3.4    tidyverse_1.3.1 

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.6        lubridate_1.7.10  prettyunits_1.1.1 ps_1.6.0          rprojroot_2.0.2   assertthat_0.2.1  utf8_1.2.1        R6_2.5.0          cellranger_1.1.0  plyr_1.8.6        backports_1.2.1   reprex_2.0.0     
[13] httr_1.4.2        pillar_1.6.1      rlang_0.4.11      curl_4.3.1        readxl_1.3.1      rstudioapi_0.13   callr_3.7.0       desc_1.3.0        munsell_0.5.0     broom_0.7.7       compiler_4.0.3    modelr_0.1.8     
[25] pkgconfig_2.0.3   pkgbuild_1.2.0    tidyselect_1.1.1  fansi_0.5.0       crayon_1.4.1      dbplyr_2.1.1      withr_2.4.2       grid_4.0.3        jsonlite_1.7.2    gtable_0.3.0      lifecycle_1.0.0   DBI_1.1.1        
[37] magrittr_2.0.1    scales_1.1.1      zip_2.2.0         cli_2.5.0         stringi_1.6.2     cachem_1.0.5      remotes_2.4.0     fs_1.5.0          testthat_3.0.3    xml2_1.3.2        fastcluster_1.2.3 ellipsis_0.3.2   
[49] generics_0.1.0    vctrs_0.3.8       openxlsx_4.2.4    tools_4.0.3       glue_1.4.2        hms_1.1.0         pkgload_1.2.1     processx_3.5.2    parallel_4.0.3    fastmap_1.1.0     colorspace_2.0-1  sessioninfo_1.1.1
[61] rvest_1.0.0       memoise_2.0.0     haven_2.4.1

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